RGB trout

An aquarium in Japan was closed for renovations, and their resident sunfish got depressed not seeing visitors. So the staff put some uniforms with printed faces against the tank, and it immediately recovered.

The blue trout and golden gar, have those vivid colours irl because of genetic mutations. (Which I think is very cool)

The carrot fish is indeed smiling.

I used animal crossing fish as a reference, they are: Pale chub, bluegill, rainbow trout, dab and olive flounder