For the most part, all fish are cold blooded. There are a few exceptions in certain parts of some fishes. Cold blooded animals rely mainly on external sources of heat, such as the sun, to heat up their bodies. Warm blooded animals can produce much of their own heat. Tuna and swordfish are mainly cold blooded, but they do have the ability to heat up their brains and eyes in order to allow for faster eye movement. This allows them to have an advantage when chasing down prey.
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