Are Fish Ectothemri? Although most fishes are strictly ectothermic, there are (of course) also fish that attain a regional endothermy in important organs and tissues, such as muscles, eyes, visceral organs, and the brain (69). Why fishes are ectotherms? Fish, amphibians and reptiles belong to a group called ectotherms meaning that these animals do not
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