Orange smallmouth!

[Gavin]

That's got to be some form of genetic abnormality, similar to the mutant "Golden" rainbows. Put it in some Andy's and a pot of grease! 

[Johnsfolly]

Link to the orange nurse shark

https://share.google/images/ELI3NDiOhe0Va4fGD

[FishnDave]

And here was an orange Crappie":

And an orange Bowfin:

Orange gar:

trout:

Disclaimer:    None of the above photos are mine... I found them on the web.