There are many different types of bottom feeder fish, but some of the most common include catfish, eels, and carp. These fish tend to feed on smaller organisms that live near the bottom of lakes and rivers, such as insects, crustaceans, and mollusks. Bottom feeders play an important role in the aquatic ecosystem by helping to keep these populations in check. In addition to their ecological benefits, bottom feeder fish are also popular among anglers because they can put up a good fight when hooked.