The Suckerfish, or common suckers, are part of the family Catostomidae and include species like the White Sucker (Catostomus commersonii). These fish have cylindrical bodies, large lips... The Suckerfish, or common suckers, are part of the family Catostomidae and include species like the White Sucker (Catostomus commersonii). These fish have cylindrical bodies, large lips, and are generally bottom dwellers. They can reach lengths of up to 20 inches, feeding on algae, detritus, and small invertebrates. Suckers are often found in clear, cold streams and lakes, playing a vital role in the ecosystem by cycling nutrients and providing prey for larger fish.Click here to read more about Suckerfish.