Darters are found in North American waters east of the Rocky Mountains, from central Canada to northern Mexico. The fish gets its name from the way it swims, darting quickly from one resting place to another.
Most darters live in clear, fast-moving streams that have gravelly bottoms.
Others thrive in lakes and rivers. During the breeding season, male darters of many species develop brilliant colors. Male rainbow darters, which become blue, red, and yellow, are especially striking. Female darters lay eggs in spring or early summer. Darters eat a variety of water insects and other fish.