"warm-blooded" FW fish?

[ewok]

this is an interesting thread/thought......

i never heard of anything like this personally though, i think fish by definition means cold-blooded....

 

[Wippit Guud]

I bet the definition of fish once included: cannot fly, and: cannot walk across land. Not to mention: cannot breathe air, but we all know a bunch that do that.

Why should warm-blooded be so weird?

 

[Slappy*McFish]

What about salmon?....they are a fresh/salt water fish. Not sure if they have the ability to raise their body temp though, but it seems they would during spawning runs.