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Channichthyidae (crocodile fish, icefish; subclass Actinopterygii, order Perciformes) A family of marine fish that have a depressed head and long snout, large mouth and eyes, and long dorsal and anal fins. In many species the blood contains few red blood cells. These fish are apparently rather sluggish, living in the cold waters of the South Atlantic and Antarctic. There are about 16 species.