Explain how a crayfish is designed to be a bottom feeder.

Bottom feeders can be seen in almost all natural water bodies and the most common among them are crabs, crayfish, bristle worms, snails, starfish, shellfish, flatfish, eels, carp, shark, etc. Even though, all those fish and other aquatic creatures, that dwells on the bottom of the water bodies are jointly called bottom feeders, the term is usually used for those fish, that are mainly found as bottom feeders in aquariums. !