above to ambushing prey from below as it grows because the number of ampullae pores remains constant throughout an individual's life giving it a high concentration of pores when it is smaller and a lower concentration when it is larger. As the ampullae pores move away from each other with the growth of the face, density decreases with age. High ampullae density make sensing immobile prey more clear whereas low ampullae concentrations are better at sensing mobile prey. As the shark grows it feeds more on squid and fish than crustaceans. This conclusion was supported by another study, which showed a switch in diet from crustaceans to teleost fish and squid. Reproduction and maturity Similar to its hunting behavior, very little is known about aphyodes's reproduction (other than that it is oviparous and lays paired eggs) and aging, partially because their biology is resistant to traditional aging techniques due to having low calcium in their vertebra in addition to those vertebra being resistant to staining and cleaning agents. Aphyodes reaches sexual maturity between 47 and 50 cm and shows sexual dimorphism with females being larger than males. Conservation status The North-east Atlantic is divided into 3 major areas by the OSPAR convention. These areas are the Celtic sea, the Bay of Biscay and the Iberian coast and the open ocean areas. The Celtic sea, which contains aphyodes habitat like the Rockall Trough in Scotlant, is densely populated with fishery catchment areas for species like Anchovy and Blue whiting in addition to containing industrial activity and marine tourism. The Rockall Trough is under increasing deep sea fishing pressure in recent years and there is worry among scientists that aphyodes and several other Apristurus species are under threat there as it's regularly caught as bycatch especially by deep sea trawling. Overfishing in the Bay of Biscay has already lead to a local extinction of elasmobranchs. According to the IUCN redlist there is not enough information to determine its conservation status however. The largest threats to biodiversity in the region are a lack of sustainable fishing regulation including bottom trawling and pollution from maritime transport such as oil spills and antifouling paint and chemical pollution such as antibiotics and pesticides from maricultural activities. This problem is compounded by a lack of deepwater monitoring programs in the North Eastern Atlantic because it is difficult to enforce regulation without population data. The North East Atlantic