The shape, size and place of a fish’s mouth is frequently a very good clue concerning its diet. There are lots of different types of fish mouths.
Поддержание низкой концентрации солей в организме хрящевых рыб осуществляется благодаря выделению солей почками, а также специализированной ректальной железой, которая соединяется с пищеварительным трактом. Ректальная железа концентрирует и выводит как ионы натрия, так и хлорид-ионы из крови и тканей организма.
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Managing by way of Every single filament are thin blood vessels identified as capillaries. Oxygen inside the drinking water enters the fish’s blood, and carbon dioxide is expelled in to the h2o, by using these capillaries.
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Like all animals*, fish need oxygen as a way to produce Power. In addition they really need to expel carbon dioxide like a squander merchandise. Most fish carry out this process with organs referred to as gills.
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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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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).