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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.
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One example is, the body is elongate in several kinds and greatly shortened in Some others; the body is flattened in some (principally in bottom-dwelling fishes) and laterally compressed in lots of Many others; the fins may be elaborately extended, forming intricate designs, or They could be reduced or maybe misplaced; and also the positions in the mouth, eyes, nostrils, and gill openings fluctuate commonly. Air breathers have appeared in quite a few evolutionary strains.
) effects from the heat exchange method within the fish's gills. Heat generated by muscle movement is transported in beginner reptile setup deoxygenated blood towards the gills, which distribute the heat to oxygenated blood, which happens to be then pumped by the guts to the remainder of the fish's body.
الموثوقية والمتانة، لا يمكن أن تكون مدة الخدمة أثناء الاستخدام المتكرر أقل من عامين.
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Самец пятнадцатииглой морской колюшки сооружает своеобразное гнездо из кусочков водорослей, скрепляя их специальным секретом.
Учитывая то, что один акт нереста может длиться несколько часов, рыбы одной пары могут обмениваться половыми ролями и продуцировать поочередно яйцеклетки (икру) или сперматозоиды (молоки).
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Not all fish breathe with their gills. Lungfish have lungs, which they use possibly as an alternative to or in addition to their gills, arising towards the floor and respiratory air.
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