В формировании чешуи основную роль играет внутренний слой кожи — дерма. Хрящевые рыбы имеют плакоидную чешую, которая гомологична зубам всех позвоночных; перемещаясь в ходе эволюции на челюсти, плакоидные чешуи, собственно, и превращаются в зубы у акул и скатов. Плакоидная чешуя состоит из дентина, который формирует основу чешуй, а сверху покрыта эмалью.

The brilliance of pigments may be Improved through the surface area structure with the fish, to ensure that it Practically appears to glow. Quite a few unrelated fishes have precise light-weight-developing organs. Several fishes have the ability to alter their coloration—some for the objective of camouflage, Other people with the enhancement of behavioral signals.

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Quite a few fish have protrusible mouths, which might increase forward to aid the fish seize or manipulate foods.

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В правую и левую стороны от позвоночника отходит мембрана из соединительной ткани, которая называется горизонтальной септой (перегородкой) и разделяет мышцы тела рыбы, называемые миомерами, на дорсальную (верхнюю) и вентральную (нижнюю) части.

Major a lifestyle filled with conflict, Ziv frequently struggles between his two greatest enjoys: American soccer and US soccer.

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Fish don’t have eyelids (the eyelids of numerous terrestrial animals assist hold the eyes moist; a little something a fish obviously has no want for). Some fish Have a very nictating membrane, a clear protective include that is certainly reduced in excess of the eye for defense.

Cartilaginous fish belong to the class Chondrichthyes. Cartilaginous fish have skeletons made of cartilage – a easy, adaptable tissue – rather then of bone.

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-греч. κατά «вниз», др.-греч. δρόμάσ «блуждающий») или анадромными (др.-греч. αηα «обратно», др.-греч. δρόμάσ «блуждающий»), соответственно.