Are fish cold-blooded?

Cold-blooded animals

1. Cold-blooded animals are unable to regulate their internal body temperature with respect to the external environment.
2. Fishes are aquatic organisms that belong to the kingdom Animalia.
3. Fishes are cold-blooded. However, there are a few exceptions.
4. Some recent studies suggest that opah (moonfish) is a warm-blooded fish. Opah circulates warm blood throughout the body and survives in the cold ocean.
5. White sharks are partially warm-blooded. They can increase the temperature of certain body parts which in turn help them in swimming.