RemorasEcheneidae

Remoras (family Echeneidae) are elongated, fusiform marine fishes, reaching lengths of 30 to 110 cm (12-43 in). They possess a broad, flattened head, topped by a distinctive oval, lamellated suction disk. This modified first dorsal fin features slat-like structures and flexible membranes, enabling secure attachment to larger marine animals. Their coloration is typically drab, ranging from grey to dark brown, sometimes marked with pale stripes or blotches. Most species exhibit a slightly forked caudal fin and soft-rayed dorsal and anal fins.

These fishes inhabit both open water and reef environments, found from the surface down to depths of at least 100 m (330 ft). They attach to a variety of hosts, including sharks, rays, sea turtles, and large bony fishes. Remoras feed on external parasites from their hosts, food scraps from the host's meals, and small independent prey, detaching briefly to hunt or breed. While often seen attached, they are also encountered free-swimming near their hosts or seeking new ones. The common name 'remora' derives from Latin, meaning 'to delay', an ancient belief that these fish could slow ships.