Panther Groupers should be fed meaty marine foods including marine fish pieces, squid, clams, shrimp, prawns, silversides, large krill or similar marine meaty preparations. It is important to only feed them raw marine foods as precooked marine foods from the grocery store contain preservatives that are harmful to the fish. There are a variety of frozen meaty foods available including silversides, clams, krill and squid; as well as, freeze-dried and pellet foods made especially for larger marine carnivores. Goldfish or other freshwater feeder fish are not a good food choice as they lack the nutrients that the Panther Grouper needs to maintain a healthy immune system.