Any of various elongate brown fish from the family Echeneidae whose dorsal fin is in the form of a suction disc that can take a firm hold against the skin of larger marine animals
or sharksucker or suckerfish Any of 8-10 species of marine fishes (family Echeneidae) noted for attaching themselves to, and riding about on, sharks, other marine animals, and oceangoing ships. Remoras adhere by means of a flat, oval sucking disk on top of the head. They are thin and dark, 1-3 ft (30-90 cm) long. They live in warm waters worldwide, feeding on the leavings or the external parasites of their hosts