Which Fish Are Vegetarian? Pacus, Silver Dollars, Farowellas, and Mollies are primarily vegetarian fishes. Catfish are not fully vegetarian, but require a great deal of vegetable matter in their diet. Many other fish, from the Goldfish to Guppies, enjoy having vegetables as part of their diets.

Yes, many fish are carnivorous, such as the piranha or shark. However, some fish do not eat meat, such as the goldfish or tetra.

Like most animals, aquarium fish fall into three categories when it comes to the food they eat. Some are herbivores (preferring to eat plant-based proteins), some are carnivores (preferring meat-based proteins), and others are omnivores (happy to eat plants or meat).

By far, the best-known herbivorous fishes available in the hobby include the various plecos (Hypostomus, Glyptoperichthys and Liposarcus spp.), the bristlenosed catfishes (e.g. Ancistrus spp.), and the panaques or sucker catfishes (Panaque spp.). A considerably rarer fish is Euchilichthys guentheri.