Murray cod
Large Australian freshwater predator of the Murray-Darling basin
The Murray cod is a massive predatory fish native to eastern Australia. It dominates the Murray-Darling river system as an apex hunter and holds significant cultural value for local communities.
- Largest exclusively freshwater fish in Australia
- Can live over 48 years, possibly 70+
- Apex predator in the Murray-Darling basin
- Spawns in main river channels, not floodplains
- Threatened by overfishing and habitat loss
What it is
This species is a large, heavy-bodied fish with a deep profile that resembles a grouper. Its head is broad and scooped, housing a wide mouth filled with tiny needle-like teeth. The body displays a marbled pattern of yellowish-green to dark green on the back and flanks, fading to white or cream on the belly. Large adults often appear speckled grey-green, while smaller fish from clear waters show intense colouration. Fins are rounded and dusky, edged in white, with pelvic fins featuring trailing filaments. It is the largest exclusively freshwater fish in Australia.
Where it lives
Native to the Murray-Darling basin, this fish inhabits lowland rivers and extends into upland areas up to 1,000 metres elevation. Historically widespread, populations have vanished from many southern upland zones due to dams, pollution, and introduced trout. They also occur in the Cooper Basin in Queensland. The species prefers varied habitats, from fast-flowing rocky streams to slow meandering lowland rivers, though it has declined significantly in these upper reaches.
How it lives
As the apex aquatic predator, it consumes almost anything smaller than itself, including other fish, crayfish, mussels, and occasionally waterbirds or reptiles. While typically an ambush predator near the bottom during daylight, it hunts actively in shallow surface waters at night. These fish live exceptionally long lives, reaching over forty-eight years, which helps them survive variable environmental conditions. They rely on rare wet periods for successful recruitment of young.
Breeding and life cycle
They reach sexual maturity around five years of age. Spawning occurs in spring when water temperatures rise, often triggered by daylight length rather than just floods. Females lay eggs on hard surfaces like logs or rocks in the main river channel, not on floodplains as previously thought. Large females produce far more viable eggs and contribute significantly more to population recovery than smaller individuals.
Fish and people
Highly prized by anglers for sport fishing, they are also targeted commercially and farmed in aquaculture. The meat is valued as food, and the fish appears in the aquarium trade. Culturally, they hold importance in Australian heritage. Conservation efforts focus on protecting large breeding females and improving habitat quality, as historical overfishing and river regulation caused severe population declines.
Status and threats
Listed as threatened due to severe declines since European colonisation. Causes include overfishing, river regulation, habitat degradation, and competition from introduced species. Conservation strategies emphasize protecting large breeders and restoring natural flow regimes. Populations remain robust in some protected areas but are fragile in others, requiring ongoing management to ensure survival.
Questions people ask about Murray cod
How big can a Murray cod get?
Adults regularly reach 80–100 cm. The largest recorded specimen exceeded 1.8 m in length and weighed approximately 113 kg. Large breeding fish are now rare in wild populations due to historical overfishing pressures.
What do Murray cod eat?
They are carnivorous apex predators eating fish, crustaceans like yabbies, and freshwater mussels. They also consume waterbirds, turtles, snakes, and frogs. Diet shifts between fish and crustaceans depending on habitat abundance.
Are Murray cod endangered?
Yes, they are listed as a threatened species. Populations declined severely due to overfishing, dam construction, pollution, and introduced trout. Conservation programs aim to protect remaining habitats and large breeding females.
Where do they spawn?
They spawn in spring in the main river channel or inundated upper portions during floods. Eggs are laid on hard surfaces like logs or rocks. Recent research confirms they do not spawn on floodplains as previously believed.
Good reading and sources
The facts on this page come from the Wikipedia article "Murray cod", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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