Remora (Echeneidae) is a family of fishes of the order Perciformes. Includes 6 genera, 7 species. The first dorsal fin is displaced on the head and transformed into a suction cup. The pelvic fins are located under the pectoral fins. Marine inhabitants of tropical and subtropical waters of the World Ocean. Body length from 30 to 90 cm. Swim bladder is absent. Eggs are pelagic, hatched in the water column. Feed on small fish and invertebrates. Attached with a suction cup to large fish, turtles, whales, sometimes to the bottoms of ships. Some species (e.g., Echeneis naucrates) can live independently. Molo lives without a host. These fish feed on plankton and ectoparasites of the host. The commercial importance of Remora is small.
The most important characteristic feature of Remora is a flat oval plate starting above the nostrils, extending over the entire head and even covering part of the back. This plate has a flexible edge and 12-27 movable transverse folds, seated on the upper rib with fine teeth, and can serve for sucking. There is no anterior dorsal fin, the posterior one is pushed far back against the posterior fin; the pectoral and pelvic fins are small, the caudal fin is comparatively large and is either excised or rounded and changes, according to Day, its shape according to age. The jaws, of which the lower is more prominent forward than the upper, are studded with fine comb-like teeth. The same teeth are placed on the scopus, and the tongue has thin velvety teeth. The number of rays in the gill membrane reaches eight. The stomach is large, the intestine short and broad; there is no swim bladder. About ten species are known.