Integument system of fishes on biological discusion
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Fishes are generally grouped into three broad categories: the placoderms, the cartilaginous fishes and the bony fishes. The placoderms include the primitive and extinct fishes, the cartilaginous fishes comprise the elasmobranchs and the holocephali, while the bony fishes include the Actinopterygians, Crossopterygians and Dipnoans.
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Fishes possess numerous mucous glands in the skin that secrete abundant mucous. The slimy mucus of the fish on the skin reduces resistance during swimming. ... Mammary glands, scent glands, and sebaceous glands are present in the skin and serve different functions.
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