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.
Поддержание низкой концентрации солей в организме хрящевых рыб осуществляется благодаря выделению солей почками, а также специализированной ректальной железой, которая соединяется с пищеварительным трактом. Ректальная железа концентрирует и выводит как ионы натрия, так и хлорид-ионы из крови и тканей организма.
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Лососёвые — например, чавыча, кета или горбуша — относятся к катадромным рыбам, заходящим в реки на нерест.
При достаточно большом разнообразии видов образа жизни всех рыб можно включить в состав нескольких экотипов:
В таксонах, где половая принадлежность обусловлена социальной структурой, процесс изменения пола широко варьирует, и одна и та же особь может изменять пол несколько раз на протяжении жизни.
Top a lifestyle full of conflict, Ziv regularly struggles amongst his two best loves: American football and US soccer.
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Around forty species of lampreys are at this time acknowledged (source). Some lampreys beginner reptile setup are now living in freshwater habitats, while some migrate involving freshwater and maritime environments. Numerous lampreys are parasites, attaching them selves to the bodies of other fish with their mouths and ingesting their blood.
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Not all fish breathe with their gills. Lungfish have lungs, which they use either in place of or along with their gills, coming up to the floor and respiration air.
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