Murray Cod

Interesting Info

• The Murray Cod is Australia’s largest exclusively freshwater fish and a true giant of the Murray–Darling Basin.
• Their body is deep and powerful, coloured cream to olive-green with darker mottled patterns that provide camouflage among snags and river shadows.
• Murray Cod are apex predators in river systems, eating fish, crustaceans, yabbies, shrimp, and even the occasional waterbird, frog, or small mammal that strays too close to the water.
• Murray Cod prefer deep pools, snags, and undercut banks in slow to moderate flowing rivers, though they are also stocked in lakes and reservoirs where they thrive.
• They remain culturally significant to Indigenous Australians, featuring in Dreaming stories and traditional harvest.
• Breeding happens in spring to early summer (September–December) when rising water temperatures (16–20°C) and flows trigger spawning.
• Males select and guard a hollow log, rock ledge, or undercut bank as a nest site, where females lay 10,000–100,000 large eggs. The male then guards and fans the eggs until they hatch.
• Hatchlings drift downstream before settling, while adults are highly territorial, often returning to the same log or snag for years.
• They are relatively sedentary but can make long upstream migrations during breeding season.
• Historically, Murray Cod were widespread across the Murray–Darling Basin, but numbers declined due to overfishing, habitat destruction, dams, and barriers that blocked migrations.
• Today, they are a protected and managed sportfish — highly prized by anglers for their size, strength, and legendary status.
• Lifespan is exceptional — they can live for 40–50 years, giving them one of the longest lifespans of any Australian fish.