specially marked trails. The native animals of the area of influence of the dam are protected in order to disseminate and develop captive breeding programs for species with conservation problems. Weather In the summer, the maximum temperature is about 39 °C, the minimum in winter is -2 °C generally. The annual median is around 21 °C. Demography Ayolas has a population of 15,219 inhabitants, from which 7,749 are male and 7,470, female. In the rural area there are 10,851 and in the urban area, 4,368 people; being the second city most inhabited of the department, after San Ignacio. History The city of Ayolas was founded in 1840 by Patricio Aquino, on a request made by José Gaspar Rodríguez de Francia. In Ayolas, the Binational Entity of Yacyreta is located within the city area. When the dam was being built, the city was projected from scratch right next to the original town settlement (also known as "el pueblo" locally) so that the workforce could be properly lodged. As such the Villa Permanente was raised in 1979 as a model town with 4 basic house models in a very organize arrangement, as well as modern schools, malls, water treatment plant, hospital, police stations, and a bus terminal. As the dam project advanced and more workforce was needed the same process led to the creation of the “Mil viviendas” (thousand houses) or "Nucleo 1" and then "Nucleo 2" housing neighborhoods in the mid-1980s. These housing solutions were offered free of charge to workers to encourage them to move from more populated cities. In most cases, the regular utilities as potable water, electricity, and phone were covered by the employer, at least until the late '90s. The district is famous for fishing and specifically for fishing "EL DORADO", after the completion of the Yacyretá hydroelectric power plant, it is promoted as a tourist attraction in the area, it is currently visited by thousands of tourists from the country and the world. Economy The people from Ayolas are dedicated to livestock, trade, and fishing. Being fishing, the characteristic activity, for which the city is known. Although due to the construction of the "Yacyreta Binational Dam", working on it has become one of the main sources of work and income for the population of Ayolas that grows around it. Near the town is the hydroelectric dam of Yacyretá, "country of the moon" due to its location