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A fish is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as w Most fish are cold-blooded, their body temperature varying with the surrounding water, though some large, active swimmers like the white shark and tuna can maintain a higher core temperature. Many fish can communicate acoustically with each other, such as during courtship displays. The study of fish is known as ichthyology. There are over 33,000 extant species of fish, which is more than all species of amphibians, reptiles, birds, and mammals combined. Most fish belong to the class Actinopterygii, which accounts for approximately half of all living vertebrates. This makes fish easily the largest group of vertebrates by number of species.
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