Loaches are fish of the superfamily Cobitoidea. They are freshwater, bottom-dwelling fish found in rivers and creeks throughout Eurasia and northern Africa. Loaches are among the most diverse groups of fish.

Generally, they are peaceful scavengers that spend their time rooting about for tidbits of food on the bottom. Many loach species actually prefer to be kept in schools, and some species will literally pine away with loneliness if kept alone. Loaches are relatively easy to care for and can be good fish for beginners.