Bottom feeder is a fish or any aquatic creature that primarily lives and eat underneath a body of water. They are known as cleaner fish because it maintains the quality of ocean, river, lake, pond, aquarium or, any body of water they are living. They eat dead fish, plant-based foods, mostly algae at the surface of the water. Although they act as scavengers, they are safe to eat.
Several fish species of bottom feeders are halibut, flounder, cod, sole, catfish, snapper, and eel. Some species are crabs, shellfish, snails, and sharks. A common type is a flatfish and is popular in many cuisines worldwide; they are filleted and used for sushi and sashimi.