The Murray cod (Maccullochella peelii) is the heavyweight of Australian freshwater — our largest purely freshwater fish, an apex predator that can live for half a century, grow past a metre, and outweigh a heeler. It’s also a fish in trouble, and right now there’s a serious push to turn that around. Here’s what’s threatening the Goodoo, what’s being done to save it, and how anglers can be part of the fix rather than the problem.
Listen: this piece was prompted by ABC AM’s report, “Efforts underway to save Murray cod” (ABC AM).
Why the Murray cod matters
Few fish carry the cultural weight of the Murray cod. It’s central to the rivers of the Murray-Darling Basin, deeply significant to First Nations people, and the ultimate prize for inland anglers. They’re slow-growing and long-lived — big old fish can be 40, 50 years or more — which makes the breeding population irreplaceable: lose a metre-plus female and you lose decades of genetics that can’t be replaced in a hurry. The species is listed as vulnerable under national environment law, and across much of its range wild numbers sit well below what the rivers once held.
What went wrong
The decline wasn’t one thing — it was death by a thousand cuts across the basin:
- Habitat loss and “desnagging.” For decades the big timber snags cod depend on for shelter and spawning were pulled out of rivers to ease navigation. Take away the structure and you take away the fish.
- River regulation and altered flows. Dams and weirs changed the natural flow and temperature patterns the cod evolved around.
- Cold-water pollution. Water released from the bottom of big dams is unnaturally cold, which can shut down breeding downstream.
- Barriers to fish passage. Weirs and dams block the movements cod and other natives need to make.
- Blackwater events. When long-dry floodplains flood, accumulated leaf litter can strip the oxygen out of the water — a growing threat that can kill cod across lowland reaches.
- Carp and pest fish. Introduced carp degrade habitat and compete with natives.
- Fishing pressure and poor handling. Illegal take and rough catch-and-release both add up, especially on the big breeders.
What’s being done to save them
The good news: the recovery effort is broad, well-resourced in parts, and starting to show results. The main fronts:
- Stocking at scale. More than a million Murray cod fingerlings are released into the Murray-Darling Basin each year from government and community hatcheries. Stocking works best as a long game — sustained over many years, it carries the population through the bad seasons.
- Putting the timber back. “Resnagging” programs return woody habitat to rivers — and where the snags go back, cod numbers climb.
- Opening up the rivers. Major fish-passage programs are building fishways past weirs and dams so natives can move and breed again.
- Demonstration reaches. Long stretches of river — like the Upper Murrumbidgee — are being restored end to end (habitat, water quality, carp control) as living proof of what recovery looks like.
- Smarter rules. Protective slot limits, bag limits and a spring breeding closure are designed to shield both juveniles and the big breeding fish.
- Better science and handling. Research into fishway design, stocking genetics, transport survival and catch-and-release handling feeds straight back into management.
The long-term goal set out in the national recovery plan is ambitious: self-sustaining cod populations, with an aspirational target of restoring numbers toward 60% of pre-European levels over 50 years.
How anglers can help
Cod fishers aren’t bystanders here — switched-on anglers are one of the species’ biggest assets. The simple stuff matters most:
- Respect the closed season. Many states close cod fishing through the spring breeding period (commonly 1 September to 30 November) — give them space to spawn.
- Know the slot. Protective slot limits (keeping only fish within a set size band and releasing the big ones) protect the breeders. Slots, bag limits and seasons vary by state — always check your current local rules.
- Handle big fish like gold. Wet hands, never lie them on hot decks or dry grass, support the belly, keep air time to seconds, and release them quickly. A trophy metery is worth far more swimming than on a brag mat.
- Deal with pests properly. Every carp and tilapia you legally remove is one less competing with natives.
- Get involved. Habitat groups like OzFish and local recovery projects rely on angler volunteers and citizen science.
- Report illegal fishing to your state fisheries.
Why we care — wear the Goodoo
Outfished is built around the species we love, and few sit higher on the list than the Murray cod. The Goodoo carries embroidered Murray cod artwork on a breathable mesh-back trucker cap — a small nod to a fish worth protecting. Want to chase them the right way? Our Murray cod field guide has you covered, and the rest of the homegrown lineup lives in the Freshies range. Look after the Goodoo, and the Goodoo keeps the rivers worth fishing.
Sources & disclaimer
This article is general information only, not legal or fishing-regulation advice. Bag limits, slot limits and seasonal closures for Murray cod change over time and vary between states and territories — always confirm the current rules with your relevant state fisheries authority before you fish. The conservation context here was prompted by recent ABC coverage of Murray cod recovery efforts and draws on the public sources below.
Sources (accessed June 2026):