The term "suckerfish" refers to a group of fish that are characterized by their ability to attach themselves to other creatures or objects using their suction cup-like mouths. These fish are also known as remoras or shark suckers. Other synonyms for suckerfish include lampreys, loaches, and catfish. Lampreys, for example, have a round, jawless mouth that they use to cling onto other fish. Loaches are small freshwater fish that have a similar body shape to suckerfish and are often used in aquariums. Catfish also have a suction cup-like mouth, but they are known for their barbels, or whiskers, which help them find food.