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.
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Лососёвые — например, чавыча, кета или горбуша — относятся к катадромным рыбам, заходящим в реки на нерест.
Fish are present in bodies of drinking water all worldwide, and are a vital section in their ecosystems. Fish are heterotrophs* that carry out a variety of roles while in the meals chain.
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Gills can be found behind a fish’s head. The gills of sharks and rays open to the skin of the body; Those people of other fish are hidden at the rear of bony gill covers termed operculum.
Some fish stridulate (create seem by rubbing aspects of your body with each other) by rubbing their bones or teeth jointly.
В настоящее время рыбы — господствующая группа животных в водных биоценозах. Наряду с китообразными, они завершают цепи питания.
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