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Dr. Subhendu Datta
Sr. Scientist
Need of Water and Soil Analysis for Sustainable Aquaculture
Importance of water in aquaculture: If aquaculture is the rearing of aquatic organisms, it is important for an aquaculturist to understand the aquatic medium i.e. water, in which these organisms inhabits. If the water is "bad," plants and animals won't grow or reproduce. Animal stressed because of poor water quality are also prime targets for pathogens and parasites. Just as people who work in offices or factories that are stuffy and have smoke or chemical fumes in the air are more apt to be sick, so it is with aquatic organisms grown in poor quality of water. Water is the medium in which fish live, and from which they derive oxygen and nutrients. So the quantity and quality of the water very much affect the prospect of fish culture. As water is the basic element in fish culture, its specific properties as a cultural medium are naturally of great significance in the productivity of a pond. Pure water is unable to support living organisms, but its content of nitrogen, phosphorus, potassium and calcium salts, dissolved organic matter and gases like oxygen, nitrogen and carbon dioxide determine to a large extent the productivity.
Importance of soil in aquaculture: The properties of pond soil are of greater significance than is generally realised. When soil conditions are not favourable, the production will be limited. Productivity of fishponds depends on the occurrence of suitable environmental conditions and abundance of fish food organisms. The first step in the food chain (Fig. 1) of a fish pond is constituted by primary food organisms e.g. phytoplanktons, which derive their nutrients from the pond environment and with the help of solar radiation undergo photosynthetic activities. Occurrence of these nutrients in pond water and maintenance of its relevant chemical condition depends largely on the nature and properties of the bottom soil wherein a series of chemical and biochemical reactions continuously take place resulting in release of different nutrients in overlaying water and also their absorption in the soil mass. Considering this importance of bottom soil in maintaining the productivity of fish ponds, Hickling (1971) described such soils as the "Chemical Laboratory of the fish pond.
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Bottom Fauna -----------------------Zooplankton Bottom Flora -----------------------------------------Phytoplankton Nutrients in water Nutrients in Soil
Fig. 1: Food pyramid in a pond
The soil fertility is of special importance in the growth of benthic vegetation. While water fertility will contribute largely to the production of plankton; the pond bed releases nutrient material into the water and helps in fixation or chemical combination of such substances released in the pond itself or introduced from outside. Production in ponds with a bottom rich in fertilising elements is much greater than in those with poor soil. The colloidal content of the soil, especially of the muddy layer on the top, is of importance in its capacity to fix or chemically bind nutrients. The productive capacity of the pond bottom has to be preserved by alternate periods of mud formation and mineralisation – the practice of regularly draining fish pond. In view of this importance of overlaying water as well as bottom soil in determining the productivity of a fish pond, an intimate knowledge about the nature and properties of these two phases need to be understood thoroughly for developing a clear idea about the ecosystem and obtaining, thereform, good production of fishes.
Importance of water and soil analysis in sustainable aquaculture: As the fish catch from all sources of capture fisheries has nearly attained a saturation point, aquaculture has gained special attention to increase the fish production of the country. To achieve this goal, with time aquaculture has also shifted from conventional culture practice to semiintensive and intensive culture practices. In intensive cultural practices, there is very high load of fish, feed, nutrients and chemicals used for controlling fish diseases (e.g.
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antibiotics) per unit area. Therefore, fish excreta, respiratory products, unfed materials; unutilized nutrients/chemicals and transformed/metabolites of nutrients or chemicals can severely deteriorate the fish pond/lake environment (i.e. water and soil quality) even in short run. Every system must be sustainable. Fishery resources are renewable source of resources i.e. fish stock in an aquatic system is able to reproduce or replace them or increase. The management of renewable resources involves, as a minimum, practices that will result in a sustained yield. This emphasize the management of human use of fishery resources so that it may yield the greatest sustainable benefit to present generation while maintaining its potential to meet the needs and aspirations of future generations. In layman's language, we should practice the aquaculture in such a way so that present generation can get the earnings for their livelihood, at the same time, follow the good management practices and maintain the good fertile condition of the system (i.e. soil and water) so that it produces fish in the similar way to the future generations. Hence the importance of water and soil analysis lies for sustaining high yielding aquacultural practices. Regular monitoring of water and soil quality parameters can give an insight about the physical, chemical and biological environment of the aquatic ecosystems. This will assist to take decisions on management practices to be adopted both in terms of better fish production and maintaining the ecosystem for long run.
References 1. Hickling, C.F. (1971). Fish Culture. Faber and Faber. London. pp.225. 2. Conservation of Natural Resources (2nd ed) Gey-Harold Smith (ed)- John Wiley & Sons. Inc. Chapt. 19. Fisheries for the future. 3. Environmental Conservation. R. F. Dasman, John Wiley & Sons. Inc. Chapt. 9. Water and Fisheries.
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Physical Parameters of Water The major important physical parameters of water on which the productivity of a pond depends upon are; 1. Depth. 2. Temperature. 3. Turbidity. 4. Light.
Depth: Depth of a pond has an important bearing on the physical and chemical qualities of water. On it, but varying with its turbidity, depends the limit of penetration of sunlight, which in turn, determines the temperature and the circulation patterns of the water and the extent of photosynthetic activity. Ideal depth for different kinds of fish ponds from the point of view of congenial biological productivity are as follows; Nursery Pond : Rearing Pond : Stocking Pond : 1 – 1.5 m 1.5 – 2.0 m 2.0 – 2.5 m
Ponds shallower than 1m get over heated in tropical summers inhibiting survival of fish and other organisms. Depths greater than 5 m are also not suitable for fish culture. In such ponds along with poor penetration of sunlight, there remains the formation risk of a permanently deoxygenated layer or the circulation of water is unable to carry oxygen down to the mud layer. Formation of H2S takes place in reduced layer of pond mud and in absence of oxidizing surface layer, this poisonous gas diffuse into the water and make the deepest parts of the pond uninhabitable by fish. In such ponds there must be the provisions of plenty of breeze flowing which can keep water circulating or arrangement of artificial water circulation (aerator). Water colour: Water gets its colour due to phytoplankton, zooplankton, sand particles, organic particles and metallic ions. Clear and transparent water indicates very poor growth of plankton and water may be acidic. Water colour is golden or yellow brown if diatoms are more. This type of water is best for prawn culture. Brownish green, yellowish green and light green coloured waters are also good for prawn culture. Water becomes greenish in colour when phytoplankton is more, develops a brown colour due to zooplankton, mud
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colour due to more sand grains, black colour due to excessive accumulation of undecomposed sediments at bottom. Water with black, blackish green, dark brown, red, yellow colours are not good for culture. These colours are due to the presence of more phytoplankton, bad pond bottom and acids in the water. The red colour of water is due to the presence of high levels of iron and death of phytoplankton (phytoerythrin released). Brownish green to greenish brown colour of water is good for aquaculture. Turbidity (Transparency): 1 Transparency ∝ -------------Turbidity Transparency is inversely proportional to the turbidity of water, which in turn is directly proportional to the amount of suspended organic and inorganic matter. Turbidity due to profusion of plankton is an indication of pond's high fertility but that caused by silt or mud beyond a limit (up to 4% by volume) is harmful to fish and fish food organisms. Turbidity due to high concentration of silt, mud or algal growth causes death of fishes due to choking of gills. Suspended particles may be settled by application of lime or alum and algal bloom can be restricted by application of Takazine – 50 (Cymazine) @ 2-4 kg/acre. If the pond water is covered by floating weeds, Wolfia sp (microweeds) or Lemna minor, Lemna major, Spirodella for one week then also the algal growth is checked due to lack of penetration of sunlight. Euphotic zone is the visible zone of natural water body. *[Turbidity and transparency both are optical properties of light, turbidity causes light to be scattered thereby restricts its penetration and reduce photosynthetic activity. Suspended particles causing turbidity may also adsorb considerable amount of nutrient elements like phosphate, K, N2 in their ionic form and making them unavailable for plankton production, while transparency cause light to be transmitted in straight line through the sample.]* Secchi disk transparency: 30-50 cm is ideal for good productivity. It is a metallic plate of 20 cm diameter with four alternate black and white quadrants (to give a sharper end point but generally at a smaller depth) on the upper surface and a hook at the center to tie a graduated rope. The procedure in simply to observe the depth at which the disk let down from the surface just disappear from view. The observation must be made through a shaded area of water surface. It is usual to determine the point of disappearance as the disk is lowered (d1) allow it to drop a little further, and then determine the point of
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reappearance as the disk is raised (d2). The mean of the two readings is taken as the Secchi disk transparency. The observation should not be made early in the morning or late in the afternoon, though both theory and observations show that the result is largely independent or illumination. Other instrument to measure transparency are photometer, lux-meter. When Turbidity is less than 25 cm, dissolved oxygen problem could arise during the night. If it is more than 50 cm, then less plankton is produced in the pond water. In less turbid waters, the aquatic weeds growth is more. If the water is more turbid due to sand or silt, it should be stored in sedimentation tanks and then used for fish culture. If the turbidity is more due to phytoplankton, water in the pond should be changed. Fertilizers have no effect in high turbid waters, hence fertilization of the pond should be stopped. Temperature: Variations in temperature in a water body has a great influence upon its productivity. Temperature influence all metabolic and physiological activities and life processes such as feeding, reproduction, movement and distribution of aquatic organisms. Temperature also affects the speed of chemical changes in soil and water. The oxygen content of water decreases with rise in temperature. Most of the tropical fish cann't survive below 100C. Tilapia cann't survive below 80C. Indian major carps are able to tolerate a wide range of temperature (18 to 380C), optimum being 20-32oC, below 16oC and above 400C prove fatal to them. Many exotic species can't survive at higher temperature. Fishes native to cold water (e.g. Silver Carp) are unable to survive on the plains due to higher water temperature in summer months. Both silver carp and grass carp prefers temperature below 30o C. Hence, knowledge of the range of temperature variation is necessary before introducing fishes for culture in a pond. The thermal stratification namely (i) epilimnion, (ii) thermocline and (iii) hypolimnion may not be prominent in shallow ponds. Observations conducted in Indonesia have shown that instead of an annual turnover, as found in temperate climates, a daily turnover takes place in tropical ponds. During the nights, circulation takes place, bringing about a mixing of the water. This turnover is of extreme importance in the circulation of oxygen and nutrients in pond water.
Light: Light is an important factor influencing productivity, penetration of light depends upon the available intensity of the incident light, which varies with the geographical
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locations of the pond and turbidity of water. In shallow ponds, light reaches upto the bottom and causes heavy growth of vegetation. Light controls the flora and oxygen content of the water of the pond. Shade provided by the surrounding vegetation affects the incidence of light on the pond. Advantage of shading effect in often taken in pisciculture effect for the control of algal blooms and submerged weeds. Among other physical factors, shore conditions, pressure and movement of water plays some role on productivity of pond water.
Pressure and Movement of Water: All animals cannot survive in very deep water due to increase in pressure and variation of percentage of mineral salts. Movement of water causes erosion of soil and increase turbidity. Movements of water due to waves, currents and breeze favours productivity provided motion is not too strong to bring about unfavourable changes in the condition of water. Shore Conditions: Longer shoreline enhances productivity due to increase in the production of vegetation and phytoplankton. But shady shore trees, surface and submerged plants and turbidity due to silt lowers the productivity by cutting light.
Chemical Parameters of Water Water pH: Logarithm of the reciprocal of hydrogen ion concentration in moles per lit. pH = log 1 = − log [H + ] + [H ]
At pH 3, concentration of H+ ion in water is 0.001 mole/L, at pH 4 concentration of H+ ion in water is 0.0001 mole/L. Therefore, at every 1 unit rise of pH, concentration of H+ ion decreases 10 times, so, acidity of water decreases 10 times and basicity increases 10 times. Similarly at every 1 unit decrease of pH, acidity of water increases and basicity decreases 10 times. pH scale is for very weak base or weak acid i.e. pH of 1N acid (HCl) is '0' and 1N base (NaOH) is 14. So in pH scale, concentration of any acidic or basic medium above 1N can not be measured in pH scale.
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pH Range <5.5 5.5 – 6.5 6.5 – 7.0 7.0 – 8.5 8.5 – 10.5 > 10.5 (Strongly acid) (Acid Water) (Neutral (Slightly Alkaline) (Alkaline) (Strong Alkaline)
Productivity of Water Unproductive. Low Productivity. Average Productivity. Most Productivity. Low Productivity. Unproductive.
The pH of the water is indicative of its fertility or potential productivity. A slight alkaline reaction is of great help in the conversion of organic matter into assimilable substance, such as ammonia and nitrates (mineralization). The majority of the natural mater is alkaline and alkalinity is mainly due to the salts of calcium in the form of bicarbonate and carbonate. Dominated by Strong acid (H+) dominates Free CO2 dominates HCO3 CO3 OH
pH Range >4.0 5–7 7–9 > 9.0 > 11
(OH ions arises from hydrolysis of HCO3- and CO3- - ions) The pH of pond water undergoes a diurnal change, it being most alkaline in mid-afternoon and most acidic just before daybreak. During night, due to respiration of plants and animals, CO2 is produced which on hydrolysis produce H2CO3 and make the water acidic. H2O + CO2 = H2CO3 Concentration of CO2 is highest just before daybreak. So, the water is most acidic. During daytime, this CO2 is used up for photosynthesis and makes the water alkaline (as in natural water, HCO3- and CO3-- responsible for basic reaction, are dominated when CO2 is used up). pH > 9.5 is not suitable as CO2 is absent and photosynthesis does not occur and fish die. Above pH 11, water alkalinity: Reduce the appetite of the fish, their growth and tolerance to toxic substances; Increase toxicity of H2S, copper and other heavy metal to fish; Impeding the circulation of nutrients by reducing the rate of decomposition; Inhibit the nitrogen fixation;
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Fish gets prone to attacks of parasites and diseases. Water more acidic than pH 5.5 is not fertilized until they are corrected by liming. In acid waters, it is desirable to use non-acid forming fertilizers. pH <4.5 4.5 – 7 7.0 – 8.5 8.5 – 11 MANAGEMENT lime with Ca(OH)2 to pH 6-6.5, use basic fertilizers. lime with CaCO3, use basic fertilizers Most suitable use acid forming fertilizers.
Acidic fertilizers: NH4Cl > (NH4)2SO4 > Ammonium Sulphate Nitrate > Urea > S.S.P Basic fertilizers: Rock phosphate > CaCN > Sod. Nitrate > Ca-nitrate. Neutral :Calcium ammonium nitrate (CAN).
Calculate dose of lime for treating the pond water from the table given under soil pH taking into consideration that pH of pond water is approximately 1 unit more than pond soil.
Dissolved Oxygen This is the most important factor governing the carrying capacity of pond or lake. Sources of Oxygen (O2): (i) (ii) Absorption from air at the water surface. Photosynthesis of chlorophyll bearing organism inhabiting pond.
Consumption of Oxygen (O2): (i) (ii) Respiration of aquatic animals and plants in day and night. Decomposition of organic matter *[Do not stock fish in newly constructed pond]. The O2 available in pond at a given time is balance of these two processes. Value of dissolved O2 depends on temperature, partial pressure of O2 and water salinity. When temperature increases dissolved O2 decreases. [According to Le Chatelier's theorem when a system at equilibrium is subjected to any external stress (e.g. change of pressure, temperature or concentration), the system will change in a direction in which it can release some of this additional stress (dissolution of neutral gases generally takes place with evolution of heat), thereby decreasing the temperature of the system]. Rate of respiration is more and rate of photosynthesis is low due to high temperature. When partial pressure of O2 in contact with water at the surface increases amount of O2 dissolved in water is also increases. [According to Henry's law, the amount of gas
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dissolved by a given volume of any liquid at constant temperature is proportional to the pressure of the gas i.e. g α p, g = Kp this law also holds good for individual component in a mixture of gases]. When concentrated of dissolved salts (salinity) increases dissolved O2 concentration decreases. [Gases and also many solids and liquid are less soluble in a solution than in the pure solvent (water) and far less so, if the solution is that of an electrolyte. Due to hydration of salt, the ability of water to absorb and O2 is decreased]. At 00C, fresh water contains slightly over 2.0 mg/l O2 than sea water (35% salinity). The solubility of oxygen in water is over twice that of nitrogen and about one-third that of carbondioxide. Concentration of O2 Below 3.0 ppm 3.0 – 5.0 ppm 6.0 – 5.0 ppm Pond Productivity Unproductive Average productive High productive.
When heavy infestation of aquatic weed and dense algal bloom (may be because of over-fertilization of pond) are present a marked diurnal fluctuations and dangerous oxygen (O2) deficiency may results. During day time, because of photosynthesis, water is super-saturated with O2, but during night, consumes more O2 than produced, which is severe during late hours. On cloudy days, the photosynthesis may be reduced due to lack of sunlight prolonging the night deficit in the O2 budget. But when there is a continuous cloudy days, most of the O2 fluctuation are below the critical level for fish survival (50% saturation of O2) and mass mortality of fish may occur. In some cases, heavy concentration of oxygen may also bring about mortality to fish by choking the fish to death when oxygen bubbles (e.g. for 4m death, 270% saturation is required to produce bubbles) penetrate via capillaries of gills and gets accumulated in the tissues. This case usually occurs in shallow and warm water ponds or lakes and it is also known as bubble disease.
To Mitigate the oxygen deficiency: Direct ways or Physical Methods : i) ii) iii) iv) Beating by stick on all sides of ponds; Use Aerator Introduce fresh oxygenated water from other areas to pond. Pumping of pond water by water pump
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Chemical methods: i) Apply lime @ 60 – 70 Kg/ha. ii) Apply KMnO4 @ 4 Kg/ha iii). Use UltaSil-Aqua (Aqua Zeolite) of Neospark, Drugs and Chemical Private Ltd, Hyderabad @ 10 to 40 Kg per acre. iv). Use Aqua Clean of G M Chemicals, Ahmedabd @ 25 – 35 Kg per acre at every 20-25 days. Oxygen deficiency in lakes and river cause migration of fish, attack of parasites, fungus diseases and death due to suffocation.
Free CO2 Sources of CO2 in natural water i) From atmosphere: a) Through rain water contains 0.3 – 0.6 ppm. b) Air in contact with water surface. ii) Respiration of aquatic plants and animals . iii) Decomposition of organic matter in water body. Consumption of CO2 Photosynthesis by aquatic plants and phytoplankton for production of carbohydrates. Carbon dioxide is present in three forms bound CO3- -, half bound HCO3 and free state CO2. When CO2 comes in contact with water, it produce carbonic acid H2O + CO2 = H2CO3 which displays its weak acidic character through dissociation H2CO3 = H+ + HCO3- + HCO3- Just before day-break, concentration of CO2 is highest and water is therefore, most acidic. Pond which is on calcareous soil contains free CaCO3. This CaCO3 is helpful to prevent the water pH to fall below 5.0 according to the following reaction. CaCO3 + CO2 + H2O Ca(HCO3)2
Ca(HCO3)2 is far less acidic than H2CO3, when the pond soil does not contain any free CaCO3, lime should be applied. Lime: Corrects acidity - forward reaction. Ca of Lime acts as buffer Reserve of CO2
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The solution of Ca(HCO3)2 remains stable only in the presence of certain surplus amount of CO2. Therefore, the CO2 which is necessary to retain the calcium in solution in the form of Ca (HCO3)2 is called equilibrium or free CO2. 2 to 10 ppm of free CO2 is ideal for good productivity of pond. 20 – 30 ppm of CO2 can be tolerated provided O2 is near to saturation. Above 30 ppm CO2 concentration cause depletion of O2 but air-breathing fish may survive at 100 ppm concentration.
Total Alkalinity: Since most of the organisms thrive and proliferate in alkaline waters, alkalinity is therefore, an important factor in pond productivity. The total alkalinity of water is mainly caused by cations of Ca, Mg, Na, K, NH4 and Fe combined either as carbonates and or bicarbonates or occasionally as hydroxides. Hydroxides alkalinity generally occurs in polluted water (pH>11). In other waters it is occasionally encountered during mid afternoon in surface layers in waters showing intense photosynthesis. A mixture of bicarbonate and carbonate alkalinity is generally encountered is waters of pH ranging from 8.4 to 10.5. At pH values lies than 8.3 but more than 4.5, partially no carbonate is present, but free CO2 and bicarbonates may be present. H2CO3 → HCO3- + H+ HCO3- + H2O → H2CO3 + OHCO3- - + 2H2O → H2CO3 + 2OHTotal Alkalinity Below 60 mg/lit 60 – 100 mg/lit 100 – 250 mg/lit → → → Pond Qualities unproductive Average Productivity Highly Productive
But a range of 4 to over 1000 ppm has been encountered in natural bodies of water. Water of hilly stream, sandy, rocky or very clayey areas, flooded rivers in rainy season, water in heavy rain fall areas and water infested with submerged weeds usually have low total alkalinity values. On the other hand stagnant waters is tropical plains in low rainfall areas during the summer season are likely to have high total alkalinity value
Total Hardness: Both total alkalinity and hardness of water is expressed in terms of ppm or mg/L of CaCO3 but both are not same. Hardness is the total soluble Ca and Mg Salts (in same cases Fe salts). It includes sulphates and chlorides along with CO3- , HCO3- and OH- salts.
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In most natural matters, the predominant ions are those of bicarbonates, associated mainly with calcium to a lesser degree with Mg, sulphates and chlorides of Ca and Mg predominate in waters contaminated with ocean salts or from dry land areas. Hardness may be temporary caused by soluble Ca and Mg bicarbonates and carbonates, this is also called carbonates hardness. Below pH 11, when there are no other cations except Ca and Mg, temporary or carbonate hardness value is equal to the total alkalinity value of water. Permanent hardness caused by soluble Ca and Mg sulphates and chlorides. Temporary hardness can be removed by boiling while permanent hardness cannot be removed by boiling. For this reasons it is also called residual hardness. To remove this hardness water softener, ion exchange resin, reverse osmosis filter plants are required. When we say that alkalinity or hardness value of any water is 'X' mg/L CaCO3 the meaning of this is not that alkalinity or hardness of water is only due the Ca cations and CO3 anion. Water contains all kinds of cations and anions mentioned above, but measuring all cations and anions is a tedious job and requires sophisticated equipments. So we estimate alkalinity and hardness simply by volumetric titrations and express the result as 'X' mg/L CaCO3 the meaning of this is that the alkalinity or hardness of water sample in question is equivalent to a distilled water which contains 'X' mg of CaCO3 in 1.0 litre solution. Name Soft water Moderately soft water Moderately hard water Hard water Very hard water Total hardness Level (Mg/ L CaCO3) 0 - 50 mg/L 50 -100 mg/L 100 - 200 mg/L 200 – 300 mg/L > 300 mg/L
Hardness above 50 mg/L is good for good aquaculture. In soft water toxicity of pollutant is high as it it is generally acidic in nature. Very hard water cause osmoregulatory stress to fish. Hardwater contains sufficient Ca to precipitate metal pollutants from water medium.
According to Jhigran (1987): Hardness of Water < 5 ppm Significance
Cause slow growth, distress and eventual death of fish. Such ponds
required liming. < 12 ppm Require liming for higher production
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≥ 15 ppm
Satisfactory for growth of fish and don't require addition of lime.
Dissolved Solids: The total concentration of dissolved solids (both inorganic and organic) in a water body is a useful parameter in deserving chemical density as a fitness factor and as a general measure of edaphic relationship that contributes to the productivity of the water. Electrical conductivity, which gives the total amount of ionized materials is an important measure of total dissolved solids present in water and is usually expressed as micromhos. Electrical conductivity above 400 Mmhos does not limit productivity but productivity does not increase proportionately with conductivity. Dissolved solids may be organic or inorganic. Inorganic dissolved solids are: metallic ions (eg. Ca, Mg, Na, K, Fe) in combination with anions like Cl-, SO4-2, CO3-2, HCO3-, OH-, PO4-3, NO3-, NO2- etc. and there may be trace elements like Ni, Co, Mn, Zn, Cu, Cr, Al, Silica, etc. Whereas, organic dissolved solids are: organic state of nitrogen, phosphorus and sugars, acids, fats, vitamin etc. Since, nitrogen and phosphorus are important in the field of aquaculture, it is explained briefly.
Nitrogen: Nitrogen is available to plants in three forms Nitrate, Nitrite and Ammonium. i) Free ammonia NH3 (the fourth form of nitrogen) may be harmful to fishes if it is above 2.5 mg/lit of water. It denotes that pond bottom has become foul due to excessive decomposition of anaerobic nature. The unionised (NH3) form of ammonia exist in equilibrium with the ammonium ion in water as per the following reaction NH3 + H2O = NH3.nH2O =NH4OH +(n-1)H2O. NH3 is also excreted through gills epithelium by fishes and crustaceans. Nitrate is very much useful for growth of phytoplankton and vegetations in water. NH4 and NO3-N may be applied to pond from outside as fertilizers. Certain quantities of nitrogen may be taken into soil and water from the atmospheric nitrogen by rain or lightning. There ware also soil bacteria (Rhizobium) that can fix atmospheric nitrogen in the roots of leguminous plants and then make it available to the phytobiota. However, ponds derive the major supply of nitrogen from the putrefaction of organic nitrogen. Organic nitrogen forms about 50% or more of the total soluble nitrogen in surface waters of lakes
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and ponds. Decomposition of this organic nitrogen by anaerobic bacteria produces NH4N, the process is called ammonification. Aerobic decomposition of NH4-N by two groups of nitrifying bacteria produces NO3-N via two steps. In the first step, nitrosomonas produces NO2-N, the NO3-N is produced by nitrobacter from NO2-N in second step. The immediate conversion of NO2-N to NO3-N is beneficial as NO2- is toxic to aquatic life. Nitrate (NO3-) is very much useful for growth of phytoplankton and vegetations in water. NH4 and NO3-N may be applied to pond from outside as fertilizers. Both NH4- and NO3-N are taken up by aquatic flora and fauna, which is the major source of organic nitrogen in pond. The NO3-N is again transformed to elemental nitrogen via oxides of nitrogen (NO, NO2-, N2O etc.) by denitrifying bacteria (e.g. Pseudomonas).
Free Nitrogen in Air Nitrogen fixation by BGA and Azotobacter Denitrification by denitrifying bacteria Oxides of Nitrogen Fauna
Organic Nitrogen in Pond Anaeorobic decomposition by bacteria and fungi
NO2 Aerobic decomposition by nitrifying bacteria (Nitrification)
Fig. 2: Simplified Nitrogen Cycle in ponds and lakes.
The process of tying up nitrogen in organic form from simple elements or inorganic form is called immobilization, its slow release especially conversion from organic to inorganic or elemental form is called mineralization. Nitrogen is a very important element in pond fertility. Presence of available nitrogen @ 0.2 – 0.5 mg/lit of water is good for production NH4 – N : 0.2 – 0.5 mg/lit
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0.02 – 0.2 mg/lit <0.014 mg/lit
1 + − [O] 2H [O] [O] NH 4 → HONH 2 − → HONNOH → NO 2 → H + + Energy 2
+ NO2 NO3 + Nitrate →
Nitric Oxides
Nitrous Oxides
Elemental Nitrogen
Phosphorus is recognised to the most critical single factor in the maintenance of pond fertility. It occurs in three forms. 1. The soluble inorganic phosphate phosphorus (PO4) 2. Soluble organic phosphorus and 3.The particulate organic phosphorus occurring in plankton, detritus and sedimentation. Out of these three forms, form PO4 i.e. soluble inorganic phosphate phosphorus or dissolved phosphorus takes part in production. It is required for cell division, preparation of fat, protein, high energy compounds (ATP, ADP, AMP) etc in the body. If pond soil is acidic, phosphorus become unavailable and stays in compound form with Fe, Al, Mn, Zn, For this reason, phosphate fertilizers are applied with lime in acidic soil. But, if the condition is highly alkaline, the phosphate again remains in pond soil as a compound form with Ca and Mg. Availability of phosphorus is highest near neutral pH. Sources of phosphorus in natural water: (i) Weathering of phosphorus bearing rocks (apetite) (ii) Leaching of soils of the catchment area by rain (iii) (Cattle drop, night soil) organic manure and inorganic fertilizers (SSP, Nitrophosphate, DAP) added to the pond. Dissolved phosphate :- <0.05 ppm – unproductive pond; 0.05 – 0.20 ppm – medium to high productivity. Lack of phosphorus is often the chief cause of poor productivity of water. An amount of 0.2 to 0.4 mg/lit of phosphorus. Phosphorus pentaoxide is good for production in pond water. Excess of phosphate in open waters is a sign of heavy organic pollution. The various phosphorus cycle involve following processes:
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Liberation of phosphorus into epilimnion due to decay of littoral vegetation by microbial degradation; Uptake of phosphorus by phytoplankton; Uptake of phosphorus from water by littoral vegetation, during the periods of their rapid growth. Loss of phosphorus as a soluble compound. Less assimilable then ionic phosphate, from phytoplankton, followed by show regeneration of ionic phosphate; Sedimentation of phytoplankton and other phosphorus – containing seston, perhaps largely faecal pellets, into the hypolimnion; Liberation of phosphorus from the sedimenting seston in the hypolimnion when it reaches the mud – water interface; Diffusion of phosphorus from the sediments into the water at those depths at which the superficial layer of mud lakes on oxidized microzone – like many other ions in presence of O2, phosphorus ions are absorbed on colloidal ferric hydroxide in the oxidized microzone of the bottom of mud, and in absence of O2, the ferric ion is reduced to ferrous from and phosphorus in a soluble form is released in the water, thus indicating that the presence or absence of oxygen in the critical factor for release of phosphorus. Even when it is released in water in soluble form, its availability will be determined by water pH and presence or absence of soluble Al, Fe, Mn and Ca and minerals containing these cations.
2 1 3
Littoral Veg
Fig 3. Simplified Phosphorus Cycle in Pond
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PHYSIO – CHEMICAL PARAMETERS OF FISH POND PARAMETERS POND QUALITIES UNPRODUCTIVE WATER 1. p.H 2. 3. D.O (Mg/lit) Free CO2 (Mg/lit) AVERAGE PRODUCTIVE 6.5 – 7.5 3.0 – 6.0 Traces – 3.0 HIGHLY OTHER REMARKS PRODUCTIVE 7.5 – 8.5 6-10 5.0 – 15.0
<6.5 >8.5 >3.0 (or nil)
20-30 ppm can be tolerated provided O2 is near saturation, >30 ppm cause depletion of O2 and mortality of fish, air
4. 5.
Total Alkalinity Temperature
100-250 20-30 C for nursery pond & 20-35 C for stocking pond. Greenish 20 – 60 cm 0.2 – 0.5 0.02 – 0.2 <0.014 0.02-0.2 for nursery / rearing pond and stocking pond.
6. 7. 8.
10. 11.
Colour Turbidity NH4 – N (Mg / Lit) NH3 – N (Mg/Lit) NO2 – N (Mg / Lit) Phosphorus (P2O5) (Mg/Lit) Hardness (ppm CaCO3) Transparency
10 – 50
> 50 Optimum Range in production ponds is between 20 cm – 60 cm.
SOIL 1. PH 2. Available Nitrogen (Mg/100 gm soil) Available Phosphorus (Mg/100g) Free CaCO3 (%) Organic Carbon(%) Carbon Nitrogen Ratio
< 5.5 > 8.5 <25.0
5.5 – 6.5 25 – 50
6.5 – 7.5 50 – 75
3.0 – 6.0
6.0 – 15.0
4. 5. 6.
<1.0 < 1.0 < 0.5 <5
1.0 – 2.0 1.0 – 2.0 0.5 – 1.5 5 – 10
2.0 – 5.0 2.0 – 5.0 1.5 – 2.5 10 – 15
Water & Soil Management for Sustainable Aquaculture
Subhendu Datta
A thin layer of soil covers most of the earth's land surface. This layer, varying from a few centimeters to 2 or 3 meters thickness, might appear insignificant relative to the bulk of the earth. Yet it is in this thin layer of soil that the plant and animal kingdoms meet the mineral world and establish a dynamic relationship. Plants obtain water and essential nutrients from the soil. Animal depends on plants for their lives. Plant and animal residues find their way back to the soil and are decomposed by the teeming microbial population living there. Life is vital to soil and soil is vital to life. The soil is a very complex system. A given volume of soil is made up of solid liquid, and gaseous material. The solid phase may be mineral or organic. The mineral portion consists of particles of varying sizes, shapes, and chemical compositions. The organic fraction includes resides in different stages of decomposition as well as live active organisms. The liquid phase is the soil water, which fills part, or all of the open spaces between the solid particles and which vary in its chemical composition and the freedom with which it moves. Te gaseous or vapour phase occupies that part of the pore space between the soil particles that is not filled with water; its composition may change within short intervals of time. The chemical and physical relationships among the solid, liquid and gaseous phases are affected not only by the properties of each but also by temperature, pressure and light. The different types of soil found in Indian are alluvial soil, black (regur) soil, red soil, laterite soil, forest soil, desert soil, saline and alkaline soil, and peaty soil. Soil plays an important role in determining the fertility of fish ponds. The basic criterion for selection of a site for construction of ponds is that the soil should not be porous. The soil condition is an important environmental factor influencing water quality and controlling various production processes. Banerjea (1967) classified pond productivity into three categories – low, medium and high – based on status of available nitrogen and phosphorus and organic carbon as below: Pond Productivity Available N (mg/100 g soil) Available P2O5 (mg / 100 g soil) Organic Carbon (%)
Low Medium High
Less than 25 25 – 30 Above 50
Less than 3 3–6 Above 6
Less than 0.5 0.5 – 1.5 Above 1.5
Water & Soil Management for Sustainable Aquaculture
Subhendu Datta
Physical parameters of soil Pond mud
While water fertility contribute largely to the production of plankton, the pond bed releases nutrient material into the water and helps in fixation or chemical combination of such substances released in the pond itself or introduced from outside. Pond productivity is increased only when the pond mud is rich in nutrients (phosphorus, nitrogen, organic carbon etc.). The colloidal content of the soil especially of the muddy layer on the top, is of importance in its capacity to fix or chemically bind nutrient. The productive capacity of the pond bottom has to be preserved by alternative period of mud formation and mineralisation – the practice of regular draining of fish ponds. Clayey soil is most suitable for pond construction, as it has maximum water retentivity and can easily be compacted and made leak proof. However, well compacted loamy soil may also be used. Pond mud should be loose and well aerated. To achieve this, the pond mud is normally dried up after the harvesting of fish crop. Pond soil differs from field soil in many respects. Pond soil is water logged and gas phase is absent. Only the top 2 to 5 cm of soil is concerned with nutrient-ion exchange and below this, soil is unaerated and has negligible involvement in the production cycle. Pond having large catchment area, where from it receives dissolved nutrient and sedimentary particles by precipitated rain water. The sedimentation of organic matter on the pond modify its properties. Besides, production and decomposition of minute plant and annual organisations in pond also modify the properties of pond bottom to a great extent. A true pond mud (rich in nutrients) is made up of fine soil particles, which contains deposits of certain amount of organic matter derived from the bacterial breakdown of plant and animal material present in a water body. The broken – down organic matter may exist as humus (derived from acid and peaty soils) and it is a mixture of colloidal acids. Humus acid is made up of 32% of protein – like material in firm combination with about 68% of another complex containing no nitrogen and its acts as a weak base which results in high adsorption capacity.
Chemical parameters of soil
The major chemical factors of importance are: (a) pH (b) Nitrogen (c) Phosphorus
Water & Soil Management for Sustainable Aquaculture
Subhendu Datta
(d) Organic carbon and C/N ratio (e) Calcium and potassium A production pond soil should have a total and available quantity of raw material along with the requirements of the organisms as to the suitability of conditions of existence and supply of nutrients.
(a) Hydrogen-ion-concentration( pH):
The pH of a soil is closely related to the relative amounts of acidic cations (H+ and Al+3) and bases on its cationic – exchange sites. The pH rise when the concentration of bases increases and drops when the concentrations of acidic cations increase. The Al+3 ion is much less common than H+ at pH values above 5 but becomes the dominant ion in extremely acid soils. The acidity of soil is formed by formation of H2S gas, methane and short chain fatty acids by the process of decomposition of organic matter due to absence of sufficient oxygen in the bottom of pond. So, the pond soil should be buffered naturally or else it may reduce the rate of bacterial action, which influences productivity. The pH of soil helps in transformation of soluble phosphates and controls the adsorption and release of ions of essential nutrients at soil-water interface.
pH range
4.0-4.5 4.6-5.0 5.1 - 5.5 5.6-6.5 6.6-7.5 7.6-8.5 > 8.5
Soil Condition Highly acidic Highly acidic Moderately acidic Slightly acidic Near neutral Slightly alkaline Highly alkaline
Lime (CaCO3) dose/Kg/ha* 2000 1000 750 500 250 100-200 No lime, apply RCD 20-30 tons/ha or Zypsum @ 5-6 tons/ha for saline soil apply Dolomite.
*For Slaked lime Ca(OH)2 – dose 3/4th and for quick lime CaO – dose will be ½ of Lime (CaCO3) dose
However, pH range of soil from 6.5-8.0 has been considered favourable for fish ponds.
(b) Nitrogen:-
About 99% of the combined nitrogen in the soil is contained in the organic matter (humus) in the form of amino acids, peptides and easily decomposed proteins. It may also be in the form of inorganic compounds such as NH4+ and NO3 which are utilized by green plants (phytoplanktons) Anaerobic organisms (bacteria) helps in the decomposition of organic matter into simple inorganic forms forming products such as CO2, water and ammonia which influences directly or indirectly in pond productivity.
Water & Soil Management for Sustainable Aquaculture Subhendu Datta
The range of available nitrogen 50 – 75 mg/100 gm of soil is relatively more favourable for pond productivity. Though nitrogen are mostly available from organic matter, it can also be made available by fixing atmospheric nitrogen into organic nitrogen with the help of nitrogen – fixing bacteria present n the soil and water, blue green algae and some micro-organisms.
(c) Phosphorus:
Phosphorus has been called "the key to life" because it is directly involved in most life processes. It is second only to nitrogen in frequency of use as a fertilizer element. One or both of these elements are nearly always included when a fertilizer is applied. Phosphorus occurs in the soil in both inorganic and organic forms. The inorganic phosphorus are calcium phosphate, aluminium phosphate, iron phosphate and reductant soluble phosphate whereas organic phosphorus may occur as phytin or phytin derivatives, nucleic acids and phospholipids. The organic form constitutes about 35 – 40% of the total phosphorus content of the soil. The availability of phosphorus is important to aquatic productivity owing to the fact that PO4 ions in soil form insoluble compounds with iron and aluminium under acidic conditions and with calcium under alkaline conditions, rendering the phosphorus ion unavailable to water body. Experiments show that alkaline soil adsorbs more phosphorus than acidic soil. However, phytoplankton helps in uptake of available phosphorus, which is stored for use in their cells, and as a result it helps in production of their population, which may directly or indirectly affect pond productivity.
Soil Phosphorus (P2O5) < 3 mg / 100 gm (30 ppm) 3 – 6 mg/ gm (30 – 60ppm) 6 – 12 gm (60 – 120 ppm) > 12 gm (120 ppm)
Pond Productive Poor Productivity Average Productive High Productive Poor Productive
(d) Organic carbon and C/N ratio: Organic compounds present in the soil exert a profound influence on almost every
facet of the nature of soil. Organic compounds are usually broken up by bacteria into inorganic compounds, which are consumed by phytoplanktons and are passed on to fish crop. Microbiologist believe that the bacterial activity depends both on the carbon content and the ratio of C/N in the parent organic substance. The significance of organic fertilizers lies in their carbohydrate content. The nitrogen fixation stops when carbohydrates are
Water & Soil Management for Sustainable Aquaculture Subhendu Datta
absent in the organic compound. The bacterial activity is low when C/N ratio falls below 10:1 and high when the ratio is 20:1 or higher.
Organic Carbon Content Pond Productivity Raw cowdung to be applied (Kg / Hac) 20,000 1000 – 10000 No Need.
0.25 % 0.5 – 1.5 % 1.5 – 2.5 %
Law Productive Average Productive Highly Productive
On the other hand, when the C/N ration is <5, the pond shows poor production. Better production is found in the ratio 5 to 10 and 10 to 15 (ideal conditions). However, the ratio above 15 appears to be less favourable for pond production.
(e) Calcium and Potassium
Calcium is generally present in the form of CaCO3 (Calcium Carbonate). It helps in translocation of carbohydrates, acts as an integral component of plant tissue, increase the availability of other ions and reduces the toxic effect of single salt solution of other elements. It was however, noted that no marked influence of exchangeable calcium upon productivity could be noted. On the other hand, potassium also helps directly or indirectly in pond production though its optimal concentrations in soil are not known. It is taken up readily by submerged weeds for growth. During rapid plant growth period, potassium from the water and soil is stored in the tissues. Ponds with sandy and non-absorptive soils have poor potassium content and respond most markedly to fertilization.
The chemistry of pond mud Mechanism of Release of Nutrients from the pond mud Importance of dry period and repeated netting operations Redox potentials and Fate of added fertilizers are discussed in the topic "Soil water interaction and its importance in Aquaculture"
Water & Soil Management for Sustainable Aquaculture
Subhendu Datta
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|By Business Wire
Article Rating:
|November 7, 2012 03:18 PM EST
Building on the award winning Priasoft Migration Suite for Exchange, leader in Microsoft Exchange Migration and Management software provider Priasoft today unveiled the latest upgrade of its flagship software, Priasoft Migration Suite for Exchange 6.5. The new release adds support for Microsoft Exchange 2013 and includes new mixed-mode migration support for Exchange upgrade scenarios.
"Priasoft continues to lead in Microsoft Exchange migration solutions," said Eriq VanBibber, vice president of Enterprise Messaging Products, Priasoft. "Companies depend on e-mail and need migration solutions that enable IT departments to efficiently and safely migrate messaging systems and preserve the user experience. Our support for Exchange Server 2013 and for mixed-mode based migrations will enable companies to migrate more quickly and easily, and facilitate ongoing management of those systems."
A few Major improvements
- New support for Microsoft's Exchange 2013. In this release you can migrate from Exchange 5.5, 2000, 2003, 2007 or 2010 directly to Exchange 2013.
- New support for mixed-mode (inra-org) based migrations. You can now migrate while in Exchange mixed-mode between 2000, 2003, 2007, 2010 or 2013.
- Enhanced Dry Run mode support for both cross-forest and Mixed-mode based migrations. Dry Run mode is a unique Priasoft feature that allows customers to fully test and obtain accurate metrics about their migration prior to actually doing them live in production.
- New Priasoft secure cloud integrated features provide more robust reporting, ease of use and management capabilities.
- This release supports Windows Server 2012 or Windows 8-based operating systems.
The new version of the Priasoft Migration Suite for Exchange, with Exchange 2013 support, will be available starting today and may be purchased by calling 602-801-2400 or emailing [email protected]. A free evaluation will be available at www.priasoft.com.
About Priasoft
Priasoft is the recognized expert in Microsoft Exchange Migration and Management, pioneering the Exchange-to-Exchange migration software market by delivering the first product in 1999. Priasoft solutions are used by small, mid-sized and large market-leading companies worldwide to manage, control and optimize the performance, availability and security of their IT infrastructures. For more information on the company or its products, please visit www.priasoft.com, or call 602-801-2400.
All trademarks, trade names, service marks, and logos referenced herein belong to their respective companies.
[guide] Cloud Analytics for Dummies | @CloudExpo @Informatica #API #Cloud #Analytics #BusinessIntelligence
Cloud analytics is dramatically altering business intelligence. Some businesses will capitalize on these promising new technologies and gain key insights that'll help them gain competitive advantage. And others won't. Whether you're a business leader, an IT manager, or an analyst, we want to help you and the people you need to influence with a free copy of "Cloud Analytics for Dummies," the essential guide to this explosive new space for business intelligence.
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UpGuard has become a member of the Center for Internet Security (CIS), and will continue to help businesses expand visibility into their cyber risk by providing hardening benchmarks to all customers. By incorporating these benchmarks, UpGuard's CSTAR solution builds on its lead in providing the most complete assessment of both internal and external cyber risk. CIS benchmarks are a widely accepted set of hardening guidelines that have been publicly available for years. Numerous solutions exist t...
Jul. 30, 2016 07:45 AM EDT Reads: 854
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In addition to all the benefits, IoT is also bringing new kind of customer experience challenges - cars that unlock themselves, thermostats turning houses into saunas and baby video monitors broadcasting over the internet. This list can only increase because while IoT services should be intuitive and simple to use, the delivery ecosystem is a myriad of potential problems as IoT explodes complexity. So finding a performance issue is like finding the proverbial needle in the haystack.
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There will be new vendors providing applications, middleware, and connected devices to support the thriving IoT ecosystem. This essentially means that electronic device manufacturers will also be in the software business. Many will be new to building embedded software or robust software. This creates an increased importance on software quality, particularly within the Industrial Internet of Things where business-critical applications are becoming dependent on products controlled by software. Qua...
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In his session at Cloud Expo, Robert Cohen, an economist and senior fellow at the Economic Strategy Institute, will provide economic scenarios that describe how the rapid adoption of software-defined everything including cloud services, SDDC and open networking will change GDP, industry growth, productivity and jobs. This session will also include a drill down for several industries such as finance, social media, cloud service providers and pharmaceuticals.
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DevOps at Cloud Expo – being held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Am...
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The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportuni...
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"We host and fully manage cloud data services, whether we store, the data, move the data, or run analytics on the data," stated Kamal Shannak, Senior Development Manager, Cloud Data Services, IBM, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York City, NY.
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IoT is rapidly changing the way enterprises are using data to improve business decision-making. In order to derive business value, organizations must unlock insights from the data gathered and then act on these. In their session at @ThingsExpo, Eric Hoffman, Vice President at EastBanc Technologies, and Peter Shashkin, Head of Development Department at EastBanc Technologies, discussed how one organization leveraged IoT, cloud technology and data analysis to improve customer experiences and effi...
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Predictive analytics tools monitor, report, and troubleshoot in order to make proactive decisions about the health, performance, and utilization of storage. Most enterprises combine cloud and on-premise storage, resulting in blended environments of physical, virtual, cloud, and other platforms, which justifies more sophisticated storage analytics. In his session at 18th Cloud Expo, Peter McCallum, Vice President of Datacenter Solutions at FalconStor, discussed using predictive analytics to mon...
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Keeping pace with advancements in software delivery processes and tooling is taxing even for the most proficient organizations. Point tools, platforms, open source and the increasing adoption of private and public cloud services requires strong engineering rigor – all in the face of developer demands to use the tools of choice. As Agile has settled in as a mainstream practice, now DevOps has emerged as the next wave to improve software delivery speed and output. To make DevOps work, organization...
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SYS-CON Events announced today that Isomorphic Software will exhibit at DevOps Summit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Isomorphic Software provides the SmartClient HTML5/AJAX platform, the most advanced technology for building rich, cutting-edge enterprise web applications for desktop and mobile. SmartClient combines the productivity and performance of traditional desktop software with the simp...
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subset: commoncrawl


text:
July 27, 2016, 11:19 am
Clinton camp cleaning up McAuliffe's TPP mess
McAuliffe said Clinton would reverse her position on the trade deal as president.
July 27, 2016, 11:19 am
McAuliffe said Clinton would reverse her position on the trade deal as president.
July 27, 2016, 11:09 am
By Ben Kamisar
"The day she gets in, which hopefully will never happen, she will approve TPP."
July 27, 2016, 11:00 am
By Ben Kamisar
He said the media has let her slide without having a press conference in 235 days.
July 27, 2016, 10:52 am
By Jordain Carney
Sanders revealed that the president called him Tuesday.
July 27, 2016, 09:10 am
By Jesse Byrnes
Aide says Trump doesn't have a financial relationship with Russian oligarchs.
July 27, 2016, 08:29 am
By Jesse Byrnes
"Nor should he, based on his background," Biden says.
Mike Lillis 07/27/16 08:19 AM EDT
Pelosi said Clinton can attract white male voters by focusing on the economy.
July 27, 2016, 07:54 am
By Rebecca Savransky
Obama said Trump doesn't know his "stuff" and doesn't want to learn.
July 27, 2016, 07:32 am
By Rebecca Savransky
"Funny how the failing @nytimes is pushing Dems narrative," Trump tweeted.
July 27, 2016, 07:17 am
By Rebecca Savransky
"No recognition — SAD!"
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Furniture and Accessories for Your Dream Dollhouse!
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Articles tagged timothy hallinan
24 Jun 2007 // 11:00 PM
A Nail Through the Heart can be read as an anti-noir, eschewing the taciturn, solitary detective for a man whose only desire is to connect.READ more
//Mixed media
Blesst Chest "Blesst Chest Theme Song" (audio) (premiere) // Music
The Chairman Dances "Dorothy Day and Peter Maurin" (audio) (premiere) // Music
National Park Radio 'The Great Divide' (album stream) (premiere) // Music
Kendra Erika "The Truth Never Lies" (video) (premiere) // Music
//Pm Picks
Double Take: 'The Public Enemy' (1931)
// Short Ends and Leader
"Maybe The Public Enemy is a swell dish. Or maybe it ain't so tough. The Steves take on the classic tale of beer and blood.READ the article


text:
from $1.99
In Nome, Alaska, the gold rush is on. Meet the dredgers, driven by gold fever and sometimes desperate need, who pilot their ragtag dredges and dive with hoses to suck up gold from the bottom of the frigid, unpredictable Bering Sea.TV-14 Runtime: 43 minutes Release date: January 27, 2012
from $1.99
A bar brawl threatens not only Shawn's health but the Christine Rose's future. The Wild Ranger's luck is getting worse as they're down a man and have sprung a leak. The Sluicey's Ian calls in a friend who offers both experience and criticism.TV-14 Runtime: 43 minutes Release date: February 3, 2012
from $1.99
The weather may be perfect, but storms are brewing onboard the dredges as egos clash and tempers flare. Emily's first dive is almost her last when she learns the dangers of dredging first-hand.TV-14 Runtime: 43 minutes Release date: February 10, 2012
from $1.99
The season is halfway over, and tensions are running high as the dredgers search for new sweet spots. An accident with the 15 ton excavator threatens to end one deckhand's season.TV-14 Runtime: 43 minutes Release date: February 17, 2012
from $1.99
A season of simmering grievances comes to a boil. Wild Ranger owner Vern fires one of his crew. Emily falling overboard and a blocked sluice box test Zeke's patience. Rocks falling out of a faulty sluice box rain down on solo-diving Scott Foster's head.TV-14 Runtime: 43 minutes Release date: February 24, 2012
from $1.99
Bad luck and bad vibes. The crews have a car accident on the way home from some hot springs R&R. A hastily welded winch roller gives way, releasing a cable that lashes Cody's leg and sends him overboard. Scott dives with an injured leg out of stubborness.TV-14 Runtime: 43 minutes Release date: March 2, 2012
from $1.99
The dredging season is quickly coming to an end, and so are once trusted relationships between Zeke and Emily as well as Scott F and Ian. Shawn sends crewmember Robbi packing while Scott M swallows his pride and invites Steve back. But will he accept?TV-14 Runtime: 43 minutes Release date: March 9, 2012
from $1.99
Winter sets in. The now short-staffed crews try to go out once more before the ice blocks them in. Each on their own, Emily salvages and Scott M finds salvation. The crews take their earnings and face off at an auction for next year's dredging grounds.TV-14 Runtime: 43 minutes Release date: March 16, 2012
from $1.99
The Bering Sea Gold crews gather and sound off about life in Nome during and after the show. Wild Ranger Scott and Vern's reunion is explosive. Emily and Zeke answer about the exact nature of their relationship. Meet the mysterious white-bearded dredger.TV-14 Runtime: 43 minutes Release date: March 23, 2012
from $1.99
The BERING SEA GOLD crews gather and sound off about gold gained and relationships strained. Christine Rose's Shawn talks about his being stabbed. The Clark's Zeke drops a bombshell on the Sluicey crew. Wild Ranger's Scott responds to Vern's accusations.TV-14 Runtime: 43 minutes Release date: March 30, 2012
|Reality TV
|Shawn Pomrenke, Emily Riedel
|Supporting actors
|Steve Pomrenke, Zeke Tenhoff, Vernon Adkison, Mike Rowe, Cody Moen, Steve Riedel, Kris Kelly, Scott Meisterheim, Andy Kelly, Brad Kelly, Thom Beers, Derek McClarty, Daryl Galipeau, Hank Schimschat, Elaine Adkison, Tony Mann, Spenser McCleskey, Doug Gramm
|Season year
|Discovery Channel
|Purchase rights
|Stream instantly Details
|Amazon Video (streaming online video)
I liked this series when it was on TV, then it suddenly disappeared. The only downside is that it's only in SD. Any versions available in HD?Published 4 months ago by Zaphoidbeetlebox
Great show! Gold fever baby! Scott M. is a train wreck! Hey Scott, tell us again how you'd like to punch someone in the face! Yes, good show! lolPublished on February 22, 2013 by wolfie
5 stars for another great reality show
I find this show thrilling and also a bit Dangerous
I like the Gold that they recover, would highly recommend this show.
Loved the different personalities and stressful situations of each character.
Very impressed with the final meeting in California reviewing the in-depth season discussions.


text:
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7821 Coral Way Suite # 129Miami, FL 33155
From Business: Sleep Apnea Supplies, CPAP Machines, Masks Portable Oxygen Concentrators VPAP , BPAP Machines
9. Surgimed Corp
1303 NW 78th AveMiami, FL 33126
From Business: Surgimed Corporation is a medical supplier made up of dedicated employees committed to providing the healthcare community with quality products and customer service…
10. Advanced Motion Control Inc
I have never been treated with so much human kindness. Mr. Silva truly loves what he does, and it shows. I am walking and feeling better than ever…
11. Sst International Inc
7245 NW 43rd StMiami, FL 33166
From Business: Medical & Laboratory Supplies. AKUDEX. CHEM-INDEX
12. Optical World
7247 N Kendall DrMiami, FL 33156
13. Jaffe Eye Institute
18999 Biscayne BlvdMiami, FL 33180
From Business: Your eyes are the windows to your world. Keeping your vision sharp requires regular monitoring and care by experienced physicians who understand the many diseases o…
14. Kendall Prosthetics And Orthotics IncProducts
13044 SW 120th StMiami, FL 33186
15. Pan American Dental Supply
6741 Coral Way Suite 36Miami, FL 33155
From Business: Dental products for the dentist and dental technicians, best brands in the market
16. Cobra Pharmacy Plus Medical Equipment and Supplies
10825 NW 17th StMiami, FL 33172
From Business: Note: We do not carry Schedule II Drugs and narcotics like Oxycodone. Specializing in pediatric medications, medical equipments and supplies.delivery at home or wor…
17. Downtown Medical Supplies
30 NE 1st AveMiami, FL 33132
18. Medical Equipment Specialists USA
2555 SW 102nd Ave, Suite #104Miami, FL 33165
8280 NW 27st ste 502Miami, FL 33122
20. First Class Medical Equipment Corp
7105 SW 8th StMiami, FL 33144
21. Imaging Associates Inc
7208 NW 56th StMiami, FL 33166
22. One Stop Medical Supplies
377 NE 163rd StMiami, FL 33162
23. All World Medical
6802 NW 77th CtMiami, FL 33166
24. Universal Medical Distributors
Miami, FL 33185
25. Non-Invasive Monitoring Systems Inc
4400 Biscayne BlvdMiami, FL 33137
From Business: Non-Invasive Monitoring Systems is engaged in the development of innovative medical products utilizing new and unique technologies to address a wide variety of medi…
26. Life Medical Equipment
7874 NW 64th StMiami, FL 33166
27. Tebar Medical Supplies & Equipment
14341 SW 120th St Ste 102Miami, FL 33186
28. Jcr Medical Equipment
905 SW 87th AveMiami, FL 33174
29. Royal Disposable Medical
116 NE 183rd TerMiami, FL 33179
30. Emi America
5643 NW 74th AveMiami, FL 33166
All Custom Corsets is a great medical supply office. They are always welcoming with smiles and big hearts to help every patients in need. They have great rollators, canes, and other Orthopedic supplies. I come eve4ry year and would recommend everyone to go to their business if they needed any Durable Medical Equipment or Orthopedic supplies.
This place is so stocked with walking aids, bath safety items, physical therapy products, aids for daily living and athletes and are so professional. I love the way they treat their patients and clients. They will get whatever you need and everyone leaves happy. Great work, a shout out goes to the staff. Thank you for all you do for us.


text:
just got back from doing it it Florida. I got to say...it really looks fantastic! I' ll be posting pics soon...anyone have any questions I'll be...
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I am starting to grow my hair long. Will minoxidil be less effective on long hair.
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Just sent off three templates to three different companies. :D
Let's see what they're like. :D
hi guys ,
I am taking fin for 8 months , but i am afraid whether fin will loss its power as the days goes , and has lot of side effects , so...
After Costeralis' discovery on the lack of progenitor cells in the scalps of balding men I wonder why more doctors are not trying to extract stem...
i saw many pictures, including from artistry concepts, it still seems like this procedure is in it's infant stages.
i am looking to get this done...
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Articles tagged bookends
24 Nov 2008 // 10:00 PM
A Sgt. Pepper's-inspired satire…a platter of pure soul sizzle…the second act of rock's Warhol-weaned avant-garde…the beautiful noise of two voices in unison…and a backup 'band' comes into their own. Five definitive LPs -- five statements of solid rock royalty.READ more
//Mixed media
Sean McVerry 'Hourglass Switchboard 2' (EP stream) (premiere) // Music
Atmosphere "Ringo" (Singles Going Steady) // Music
Minor Soul "One Chance" (audio) (premiere) // Music
//Pm Picks
Call For Papers: Celebrating Star Trek's 50th Anniversary
// Announcements
"To celebrate the 50th anniversary of the hit franchise, PopMatters seeks submissions about Star Trek, including: the TV series, from The Original Series (TOS) to the highly anticipated 2017 new installment; the films, both the originals and the J.J. Abrams reboot; and ancillary materials such as novelizations, comic books, videogames, etc.READ the article


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Barbie Fashionistas Doll #1
About this item
About this item
Important Made in USA Origin Disclaimer: For certain items sold by Walmart on Walmart.com, the displayed country of origin information may not be accurate or consistent with manufacturer information. For updated, accurate country of origin data, it is recommended that you rely on product packaging or manufacturer information.
The Barbie Fashion Dolls are a very fashionable tribe of friends who embrace color. This season they are showing their love of the rainbow's hues with super-cute color highlights in their hair and bright outfits that showcase their personalities. These girls, like the Barbie Fashionista Doll #1, love vivid colors, sassy prints and stylish accessories. Each sports a funky pair of shoes, a piece of statement jewelry and a matching purse that offers three-in-one play! Not only is the bag the perfect complement to each sassy doll's outfit, but it can also complete the girl's look worn as a ring. In addition, the purse unlocks online content associated with the free Fashionistas app available on the AppStore. The stylish metallic studs on the bottom of the purse provide an interactive base that works with an iPhone or an iPad.
Barbie Fashionistas Doll #1:
- The Barbie Fashionistas Doll #1 sports:
- Funky pair of shoes
- Piece of statement jewelry
- Matching purse that offers 3-in-1 play
- Bag is the perfect complement to doll's outfit
- Bag can also complete the girl's look worn as a ring
- Purse also unlocks online content associated with the free Fashionistas app
- Studs on bottom of purse provide an interactive base that works with an iPhone or an iPad
- Includes: doll and purse
- Doll cannot stand alone
- Height of doll: 11.75"
|Age Range:
|5 - 7 Years
|Manufacturer Part Number:
|Primary Shelf ID:
|Assembled Product Dimensions (L x W x H):
|0.44 x 2.52 x 12.99 IN
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Customer Reviews
Customer review by maiiphuong
I can't describe how much I was happy when receiving the package from Mattel shop yesterday. I had been very nervous as it was the first time I directly ordered the products and have them shipped to my place in Vietnam, a very far country from US. With a worry about damage as I used to have with other goods shipped along this far distance before, I noted for as careful pakaging as possible when I made my order. And when the package arrived, it appeared very stable and perfect. No even tiny scratch in 15 products in carton. It showed that Mattel shop significantly noticed and arranged for my requirement. Hence I am writing to appreciate for your quality and careness brought to me. Moreover I choose this Barbie to write my appreciation as it is the best outstanding appreance in my 15 products I bought. This doll has a special design with a hot but sweet pink dress, that bring me a elegant feeling. I am sure that every little girl would love her very much.


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Promo Code 2016
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Woven Wednesday: Free Shipping on 1+ Yards of any woven fabrics through 11:59 p.m. EDT July 27th.
Preview scale: 21.0 x 18.0 inches

Change DPI Base size is 150
Collection: The Great Outdoors
fish (6197),
leaf (5393),
tree (5378),
bear (2053),
squirrel (740),
mountain (722),
raccoon (345)
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mondebettina says:
Posted about 2 years ago.
uzumakijo says:
Love all your 'Great Outdoors' collection, this is my favourite so cute and kinda funky...brilliant!
Posted almost 4 years ago.
© 2008-2015 Spoonflower Inc


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OSI-Approved Open Source (79)
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- Apache License V2.0 (3)
- Academic Free License (2)
- Common Public Attribution License 1.0 (2)
- PHP License (2)
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Libraries Software
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text:
mechanical engineer field jobs
Refine your searchClear Filters
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Senior Mechanical Design Engineer
APR Consulting, Inc. - Iowa
Mechanical Design Engineer. Printed wiring board mechanical design support; Mechanical Design Engineer who will support the electronics packaging design and...
Mechanical Engineer
THE SEFA GROUP, INC. - Lexington, SC
However, a Professional Engineer License is a plus. Chemical, or Mechanical discipline from an ABET Accredited College or University....
Senior Project Engineer
Vibracoustic - South Haven, MI
BS/Masters in technical field (Mechanical Engineering preferred). The primary responsibility of the Senior Project Engineer position is to win target customer...
Field Service Engineer
Pro Pack Inc. - Wyckoff, NJ
Mechanical or Electrical Engineering:. Experience in mechanical drawing is a plus (Autocad, Solidworks); Degree in mechanical or electrical engineering or any...
Engineering Direct Sales Estimator/Coordinator
Alaka`i Mechanical Corporation - Honolulu, HI
Establishes relationships with architects, engineers, realtors, building managers and engineers, contractors, and vendors by direct contact, mail, email, and/or...
Senior Mechanical Engineer
Hayssen Flexible Systems - Duncan, SC
The *Senior Mechanical Engineer*. We have an exciting opportunity for *Senior Mechanical Engineer*. Bachelor's of Science in Mechanical Engineering....
A&E CAD Drafter III, Seattle, WA (LOCAL ONLY)
SureSite Consulting Group LLC - Seattle, WA
Mechanical aptitude with ability to complete basic mathematical calculations. Works closely with A&E Project Managers, A&E Project Leads, Engineers, E.I.T.s, A...
Special Construction Inspectors, PE and Civil & Mechanical
Municipal Testing Laboratory - Hauppauge, NY
ICC Mechanical Inspector. Need for qualified Special Inspectors, a Professional Engineer, and Engineers preferably with some construction experience, to perform...
Reliability Engineering Manager - Genset/Truck/Trailer
Climate Controls & Security - Athens, GA
With this position, the candidate will provide guidance to direct reports, ensure field issues are reviewed, prioritized, & addressed in a timely manner....
Mechanical Design Engineer
Staging Concepts / SC Railing Company - Minneapolis-Saint Paul, MN
A Bachelor's Degree in Mechanical Engineering or equivalent is required. Design Engineers must possess a strong understanding of Materials, Building Codes and...


text:
Thomas Becnel
Department: News
Phone: (941) 315-0595
Email: firstname.lastname@example.com
Beat/Position: Feature Writer, Venice
Related Articles - Thomas Becnel
Cubans are in Sarasota, rowing to RioPublished July 22, 2016
Rowers strain in the heat, shrug off politics and smile through the language barrier as they train for next month's games.
That less-famous summer beach run for kidsPublished July 19, 2016
On Wednesday evenings, Venice youngsters race across Brohard Beach.
Racers ready for Englewood Y TriPublished July 12, 2016
For me, sitting on my butt while others train, the Englewood Y Tri feels like the beginning of triathlon season.Members of the Sarasota Storm Triathlon Club, though, have been swimming, biking and running for months."This is...
Bradenton planetarium offers interactive look at Juno missionPublished July 7, 2016
Curious about Jupiter? Look up in the western sky right after sunset.
Summer job: Groundskeeper for a dayPublished July 1, 2016
Reporter joins the crew of the workers who rank, water and mark every inch of infield at McKechnie Field
For active dads, the outdoors callPublished June 18, 2016
Getting outdoors and doing something is a multigenerational pursuit
Summer jobs: A 'Crusty Old Curmudgeon' for a dayPublished June 17, 2016
Volunteering at state park means sweating through heat, humidity
PLAY: Gators and stingrays and sharks, oh my!Published June 9, 2016
"We swimmers and paddlers take our chances with gators and sharks. If we're lucky, we get to see these beautiful and dangerous creatures swimming around us," reporter Thomas Becnel says
What's cooking at Community Haven?Published June 9, 2016
In July, construction will begin on a new Haven Industries facility
Friday's lettersPublished June 9, 2016
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text:
1943 - In Battle in Empress Augusta Bay, U.S. cruisers and destroyers turn back Japanese forces trying to attack transports off Bougainville, Solomons.
1968 - Operation Search Turn began in Mekong Delta.
(Source: Navy News Service)
Maritime Today
The Maritime Industry's original and most viewed E-News Service
Norwegian oil firm Det norske said it expected to reach full production at its Alvheim FPSO (floating storage, offloading and producing unit) overnight after a leak,
1861 - During the Civil War, the frigate, USS St. Lawrence, spots a schooner flying English colors and gave chase. Some four hours later, as she is overhauling the schooner,
Standing NATO Mine Countermeasures Group 2 (SNMCMG2) has completed its third deployment into the Black Sea under the command of Captain Ramazan Kesgin, Turkish Navy.
1776 - During the American Revolution, the Continental brig, Reprisal, commanded by Capt. Lambert Wickes, transports the newly appointed commercial and naval agent, William Bingham, to Martinique.
KVH Industries, Inc., (Nasdaq: KVHI), announced today that it is offering Videotel's new safety and training video about the Zika virus free to all mariners worldwide.


text:
Looking to improve efficiency for television broadcasters, BroadView Software and Harris Corp.'s Broadcast Communications Division have integrated their respective broadcast software products.
The integration of BroadView's traffic, scheduling and rights management capabilities with Harris automation includes the ability for each system to read from the other's database, enabling improved playlist functionality as well as:
- Transferring media information such as ingestion lists, house numbers, titles and cut numbers and durations from BroadView to Harris.
- Using Harris software tools to make frame-accurate changes and corrections to media timing and information and then having these changes automatically and seamlessly flow back to the traffic logs in BroadView to ensure accuracy prior to air.
- Transferring the "As Run" (a listing of what actually went to air) from the Harris automation system back to the BroadView traffic system for reconciling to the original schedule.
Harris' automation solutions allow broadcasters to control all types of new and legacy equipment, including VTRs, video servers, routers, master control switchers, cart machines, character generators and logo inserters.
For more information visit www.broadcast.harris.com and www.BroadViewSoftware.com.
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text:
For a moment our eyes met and it became apparent to me, how much compassion I felt towards this captured creature. We exchanged a glance and I almost felt compelled not to take her picture. It was as if she wanted to beg me not to. I did it anyways and I hope she'll forgive my indiscretion……..It was just a special moment between the two of us and I just had to take this shot.
A brief moment in time I will never forget.
Challenge winner of "Just a Little MONKEY Business" in the Eye Contact Group


text:
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Breathing Space: How Allergies Shape Our Lives and Landscapesby Gregg Mitman
View All Available Formats & Editions
Pub. Date: 08/04/2008
Publisher: Yale University Press
This book offers an intimate portrait of the ways allergic disease has shaped American culture, landscape, and life. Through the life stories of people, plants, and insects, Gregg Mitman reveals how our changing environment-physical, biological, social, and economic-has helped to create America's allergic landscape and why solutions to combat hay fever and asthma have failed.
About the Author:
Gregg Mitman is William Coleman Professor of the History of Science and professor of medical history and science and technology studies, University of Wisconsin-Madison. He is the author of two award-winning books and many journal and scholarly articles on history of science topics
Product Details
- 9780300143157
- Publisher:
- Yale University Press
- Publication date:
- 08/04/2008
- Edition description:
- New Edition
- Pages:
- 336
- Product dimensions:
- 6.10(w) x 9.20(h) x 0.70(d)
Table of Contents
Preface ix
Introduction 1
Hay Fever Holiday 10
When Pollen Became Poison 52
The Last Resorts 89
Choking Cities 130
On the Home Front 167
An Inhaler in Every Pocket 206
Epilogue 251
Notes 255
Index 297
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