Catostomus is a genus of freshwater fish commonly known as suckers. They are primarily found in North America, inhabiting rivers, lakes, and streams. These fish are characterized by their elongated bodies, large mouths, and a diet that mainly consists of algae and detritus. Suckers play an important role in their ecosystems by helping to maintain water quality through their feeding habits. There are several species within the Catostomus genus, each adapted to specific habitats. They are often recognized for their distinctive coloration and can be an interesting subject for both anglers and fish enthusiasts.