Are all fish cold-blooded?

It is not exactly true that all fish are cold-blooded.

Are Fish Warm Blooded or Cold Blooded? Mystery Decoded By Expert

Opah! First known warm-blooded fish flaps to generate heat

Scientists discover deep-sea fish is warm blooded

Cool Blooded Animals, Definition, Characteristics & Examples - Video & Lesson Transcript

Dormancy - Cold-blooded, Vertebrates, Hibernation

Fish exotic cold blooded animals seamless pattern Vector Image

Warm Blooded fish Opah fun facts Meet the Comical Opah, the Only Truly Warm Blooded Fish

Researchers Reveal The First Warm-Blooded Fish

Opah Fish Science with Nick Wegner - B-Roll: Fish & Sharks - NOAA Fisheries Video Gallery