Common Worm Eel

Interesting Info

• The Common Worm Eel is a slender, snake-like eel that lives in tropical and subtropical waters of northern Australia—from Western Australia, across the Top End, and down to Queensland.
• It is called a “worm eel” because its body is extremely thin and flexible, resembling a large earthworm in the sand.
• Their body is cylindrical, brown to grey-brown in colour, paler underneath, and lacks the prominent scales or patterns of many other eels.
• They have very small eyes and a short, rounded snout—adaptations for their burrowing lifestyle.
• The dorsal and anal fins are extremely reduced and merge with the tail, giving them a worm-like appearance.
• They live buried in sandy or muddy bottoms in estuaries, lagoons, and sheltered bays, usually in depths of 1–20 m (3–65 ft).
• Juveniles and smaller individuals are often found in shallower estuaries, while adults may burrow deeper in coastal sandflats.
• They feed on tiny benthic invertebrates, such as worms, small crustaceans, and molluscs, which they detect using their sense of smell rather than sight.
• At night, they emerge from burrows to forage, then retreat into the sand during the day to avoid predators.
• They spawn in open water, releasing eggs that hatch into transparent, ribbon-like larvae known as leptocephali.
• These larvae drift in the plankton for weeks or months before transforming into bottom-dwelling juveniles.
• They are prey for larger predatory fish such as flatheads, trevallies, and groupers, as well as wading birds in shallow habitats.
• They are rarely seen as they spend most of their lives hidden in sand or mud.
• Their burrowing helps aerate and mix sediments, playing a small but useful role in estuarine ecosystems.