endotherms homeotherms

Are Fishes Endotherms? Endotherm, so-called warm-blooded animals; that is, those that maintain a constant body temperature independent of the environment. The endotherms primarily include the birds and mammals; however, some fish are also endothermic. Are all fish endotherms or ectotherms? Unlike endotherms which can metabolically control their own body temperature, ectotherms rely upon environmental temperatures