The immense variety of cultured finfish species hampers efforts to simplify production industry wide. Approximately 170 taxa are currently cultured, including carnivores, herbivores, planktivores, and omnivores, each posing its own set of nutritional demands .
Now we are getting somewhere.
Since this is a pond forum lets look at pond fish. Bass, Panfish, Catfish, Walleye and Tilapia come to mind. These are all warm water species. The only cold water species that I can think of is trout.
Bass, Panfish, and Walleye are carnivores.
Pond Catfish are omnivores.
Pond Tilapia are herbivores.