По химическому составу дентин и эмаль акул схожи с дентином и эмалью зубов человека. Утраченные плакоидные чешуи не возобновляются, но при росте рыбы их количество увеличивается. Плавниковые шипы некоторых хрящевых рыб (например, у черноморского катрана) тоже являются преобразованными плакоидными чешуями.
Для ископаемых и современных кистеперых и двоякодышащих рыб характерна космоидная чешуя, внешняя поверхность которой образована пластом космина (откуда происходит название), а сверх него — дентина. Космин подстилается пластом губчатой кости.
Костистые рыбы не являются изоосмотическими. Большая эпителиальная поверхность жабр, необходимая для эффективного выполнения функции газообмена, потребовала выработки специальных эволюционных механизмов противодействия осмотическому стрессу в гипо- или гипертонической среде.
Several fish have protrusible mouths, that may extend ahead to help you the fish seize or manipulate food items.
При достаточно большом разнообразии видов образа жизни всех рыб можно включить в состав нескольких экотипов:
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is a member with the carp relatives Cyprinidae. It is actually indigenous to East Asia, and now stored as a pet in lots of aspects of the globe.
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Виды рыб, мигрирующие между средами с большой разницей осмотического давления, направление переноса солей через жаберный эпителий изменяется в зависимости от солёности среды: в гипертонических средах организм экскретирует, а в гипотонической среде перестраивается на поглощение солей.