The otocinclus catfish is a freshwater fish of the catfish family. There are 22 known species of otocinclus catfish. These small fish grow up to 2 inches long and appear in various colors, usually with a horizontal brown stripe running along the fish’s bodies.
Otocincluses are peaceful, skittish fish that are popular amongst aquarists because of their algae-eating behavior. Although these fish are peaceful, they’re incompatible with large, aggressive, or predatorial tank mates.