Freshwater Moray

Interesting Info

• The Freshwater Moray is one of the few moray eels that regularly ventures into freshwater rivers and streams, though it also lives in estuaries and coastal waters.
• In Australia, it is recorded mainly from Queensland, the Northern Territory, and occasionally northern WA, often in tidal rivers and coastal creeks.
• They are long and muscular with a cream to yellowish body covered in dark brown blotches or spots, giving them excellent camouflage among rocks and roots.
• They are opportunistic predators, feeding on fish, crabs, shrimp, and other crustaceans. Their sharp teeth and powerful jaws make them formidable hunters.
• Like all morays, they breathe by constantly opening and closing their mouths to pump water over their gills — a behaviour that looks threatening but isn’t aggression.
• They are typically found in shallow, rocky or root-filled pools of rivers and creeks, often hiding in holes or under logs during the day and hunting at night.
• The Freshwater Moray is euryhaline, meaning it can tolerate a wide range of salinities — from the fully marine ocean, to brackish estuaries, all the way into freshwater rivers and pools.
• Scientists think they migrate into rivers to feed and grow, then return to the sea to spawn, similar to eels (Anguillidae). This makes them an important species for understanding diadromous life cycles — fish that move between saltwater and freshwater at different life stages.
• Breeding is believed to take place in marine waters, with larvae (called leptocephali) drifting in the ocean before juveniles migrate into estuaries and rivers. This means freshwater populations depend on connections to the sea.
• Lifespan is not well studied, but morays in general can live 10–15 years or more in the wild.