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Fishes 1.jpg A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits.

Because the term "fish" is defined negatively, and excludes the tetrapods (i.e., the amphibians, reptiles, birds and mammals) which descend from within the same ancestry, it is paraphyletic. The use of the term "fish" as a biological group must be avoided.

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Lobe-finned fishes †Spiny sharks Sharks & allies
Armoured fishes Jawless fishes Ray-finned fishes