Most aquarium fish fit into one of the categories below, but some don't. For the full list please see the alphabetical fish index, or search for fish by country of origin.
Vegetarian fish Some catfish have a largely vegetarian diet; feed them potato, lettuce, cucumber or blanched peas. Some of these will have to be weighted down, or held in place with a commercially available lettuce grip (magnetic clips are far better than suction types). As with all fish, do not over feed; remove uneaten vegetable matter after a couple days