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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В экономическом отношении значительную роль играет рыболовный промысел, разведение рыб как объектов аквакультуры и торговля аквариумными декоративными рыбами.
Fishes are already in existence for much more than 450 million many years, through which era they've got advanced continuously to fit into almost every conceivable type of aquatic habitat. In a sense, land vertebrates are merely hugely modified fishes: when fishes colonized the land habitat, they became tetrapod (4-legged) land vertebrates. The favored conception of the fish like a slippery, streamlined aquatic animal that possesses fins and breathes by gills relates to many fishes, but a great deal more fishes deviate from that conception than conform to it.
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Fish are also capable to hear with their lateral lines, and a few fish detect sound with their swim bladder, which transmits changes in tension to your brain.
Мозг рыбы Головной мозг рыб принято делить на три большие части: передний, средний и задний мозг. Передний мозг состоит из конечного мозга и промежуточного мозга. На ростральном (переднем) конце конечного мозга расположены обонятельные луковицы, которые получают сигналы от обонятельных рецепторов.
литоральные — обитают в прибрежной зоне (бычки, морские собачки);
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Как и другие животные, рыбы могут болеть инфекционными и инвазионными заболеваниями (гельминтозы и другие). Для предотвращения болезней у них есть множество защитных средств. Неспецифическая защита включает кожу и чешуйки, а также слой слизи, выделяемый эпидермисом, который задерживает и подавляет рост микроорганизмов.
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