Which Fish Are Cold Blooded?

Cold-blooded means their surrounding environment largely regulates their body temperature. There are 3 classes of fishes, the jawless fishes (lampreys and hagfishes), the cartilaginous fishes (sharks, skates, rays, and related fishes), and the bony fishes

Are fish mostly cold-blooded?

It's one of the most basic biology facts we're taught in school growing up: Birds and mammals are warm-blooded, while reptiles, amphibians and fish are cold-blooded.

What does it mean that fish are cold-blooded?

Cold-blooded actually means the animal's body temperature is basically the same as its surroundings. A fish swimming in 40° F water will have a body temperature very near 40° F. The same fish in 60° F water will have a body temperature near 60° F.