Moray Eel Identification Guide

Key identification features

• Long, serpentine, muscular body that lacks pectoral and pelvic fins entirely
• Thick, scaleless skin coated in protective mucus, often with mottled or patterned coloring
• Small, rounded gill openings rather than the visible gill slits seen on most fish
• A single continuous fin fringing the back, around the tail, and along the belly
• Protruding, tube-shaped nostrils and a habit of rhythmically opening and closing the mouth to pump water over the gills

Common look-alikes

• Freshwater true eel: retains small pectoral fins and lives in fresh or brackish water rather than reef habitats
• Sea snake: has visible overlapping scales and a flattened, paddle-shaped tail for swimming, and must surface to breathe air
• Snake eel: has a hard, pointed tail tip adapted for burrowing tail-first into sand, unlike the moray's blunt tail

Where you'll see one

Moray eels live in crevices, caves, and rocky overhangs of tropical and subtropical coral reefs and rocky coastlines worldwide, usually with just the head visible while the rest of the body stays hidden. They are most active at night, hunting by scent along the reef.