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Многие виды рыб содержатся в неволе — в аквариумах. Содержание и разведение аквариумных рыб в некоторых случаях помогает сохранить редкие их виды, вымирающие в исконных местах обитания.
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Fishes are already in existence for greater than 450 million many years, through which time they may have progressed regularly to fit into almost every conceivable kind of aquatic habitat. In a sense, land vertebrates are just highly modified fishes: when fishes colonized the land habitat, they turned tetrapod (four-legged) land vertebrates. The popular conception of the fish as a slippery, streamlined aquatic animal that possesses fins and breathes by gills relates to numerous fishes, but a lot more fishes deviate from that conception than conform to it.
Rays and skates are fish with flat bodies and which propel on their own with the h2o by flapping their wing-like pectoral fins. Their mouths gills are located over the underside of the human body.
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Some fish stridulate (produce audio by rubbing parts of the human body collectively) by rubbing their bones or tooth with each other.
Многие виды рыб употребляются человеком в пищу и поэтому имеют большое промысловое значение.
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).
Oviparous fish commonly hatch within an underdeveloped condition, and carry a yolk sac in the egg that gives nutrients till the fish has the capacity to feed by itself.
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A lot of fishes are cryptically coloured and shaped, carefully matching their respective environments; Other folks are among the most brilliantly coloured of all organisms, with a wide range of hues, frequently of putting intensity, on one specific.
У большинства рыб один круг кровообращения и двухкамерное сердце. У двоякодышащих рыб два круга кровообращения и неполные перегородки в предсердии и желудочке. Кровеносная система замкнутая, транспортирует кровь от сердца через жабры и ткани тела. В отличие от сердца других позвоночных, сердце рыб не приспособлено для отделения (даже частичного) обогащённой кислородом крови (артериальной) от необогащённой (венозной).