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.

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Fishes are already in existence for a lot more than 450 million yrs, throughout which period they've got progressed frequently to fit into nearly every conceivable form of aquatic habitat. In a way, land vertebrates are just very modified fishes: when fishes colonized the land habitat, they turned tetrapod (4-legged) land vertebrates. The popular conception of the fish to be a slippery, streamlined aquatic animal that possesses fins and breathes by gills applies to lots of fishes, but a great deal more fishes deviate from that conception than conform to it.

При достаточно большом разнообразии видов образа жизни всех рыб можно включить в состав нескольких экотипов:

Pelvic, or ventral, fins are located near the foundation of the fish’s overall body, a single on beginner reptile setup possibly facet. For most fish they are located even more again compared to pectoral fins.

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Рыбы обитают как в солёных, так и в пресных водоёмах — от глубоких океанических впадин до горных ручьёв. Рыбы играют важную роль в большинстве водных экосистем как составляющая пищевых цепей.

Рыбы, как и киты, в древности считавшиеся рыбами, наряду с другими животными играют свою роль в мифологии и религии различных народов мира.

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لكي لا تشتري بطارية قديمة عن طريق الخطأ، reptile supplies UAE عليك الانتباه إلى تاريخ إنتاجها.

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