Clingfish, any of more than 150 species of small sea fishes of the family Gobiesocidae (order Perciformes), having a flattened elongated body with a sucking disc beneath the head for clinging to rocks, seaweed etc.
Clingfishes are typically small fish, with most species less than 6 centimeters (2.4 in) in length. They are scale less fishes and have wide, flattened heads and they have tapering bodies with a single dorsal fin. The skin of clingfishes is smooth and scale-less, with a thick layer of protective mucus. Most species are about 7.5 cm (3 inches) or less in length, though the South African Chorisochismus dentex is up to 30 cm (12 inches) long. Some of the tropical American clingfishes of the genus Gobiesox live in rapid streams, but most clingfishes inhabit the sea.
They have a cryptic coloration, and in some cases can rapidly change color to match their background. Most species are marine, being found in shallow waters of the Atlantic, Pacific and
They are bottom-dwelling fishes; some species shelter in sea urchins or
crinoids. Indian Oceans