Экономическая деятельность человека способна поставить под угрозу численность популяций тех или иных видов напрямую или опосредованно, через загрязнение вод, интродуцирование чужих видов, изменение русел рек и изменение климата.
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За ней идут жаберные дуги, которые несут жаберные дыхательные структуры, и наиболее каудально расположены так называемые глоточные челюсти, которые также могут нести зубы.
Many fish have protrusible mouths, which often can extend ahead to help you the fish grab or manipulate food.
Рыбы приспособились к различным условиям водной среды. Факторы, влияющие на них, делятся на:
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A fish is really an aquatic vertebrate with fins and gills. The human body of a normal fish is streamlined and included in protective scales.
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Most cartilaginous fish belong to your subclass Elasmobranchii, and that is house to sharks, rays and skates.
По характеру вырабатываемых электрических импульсов рыб делят на неэлектрических (большинство рыб), слабоэлектрических (мормиры, гимнарх), и сильноэлектрических (электрические сом, угорь, скат).