Walk the edge of almost any warm, slow waterway in Queensland — an urban lake, a canal, a weir pool, a brackish creek — and look into the shallows. Those dark, busy shapes fanning circular nests in the silt aren’t natives. They’re tilapia: African and Middle-Eastern cichlids that have exploded across Australian fresh and brackish water, and one of the most damaging pest fish the country has.
Here’s the part that catches a lot of anglers out: tilapia are one of the most popular eating fish on the planet — and in Australia you’re legally required to kill every one you catch, and you can’t take them home. Here’s the full story, the rules, and how to catch them.
Which cichlids are the problem?
“Tilapia” covers a couple of cichlid species that have gone feral here:
- Mozambique tilapia (Oreochromis mossambicus) — the big one. Introduced as an aquarium fish back in the 1970s, now widespread through south-east Queensland and beyond.
- Spotted tilapia, or black mangrove cichlid (Pelmatolapia mariae) — established around Cairns and the far north.
They’ve reached genuine plague proportions in parts of the country — dominating canals, urban lakes, farm dams, weir pools, slow river reaches and even brackish estuary fringes from the Gold Coast to Cairns, with pockets turning up in other states too.
The perfect invader
Tilapia are built to take over:
- They breed relentlessly and mature fast, so a handful of fish becomes thousands.
- They’re mouth-brooders. The female Mozambique tilapia carries her eggs — then her hatched fry — inside her mouth for up to two weeks, and the young dart back into her mouth when threatened for up to three weeks. That built-in protection gives them survival rates the natives simply can’t match.
- Conditions barely faze them. They tolerate high salinity (which is how they push into brackish and near-marine water), low oxygen, and a huge temperature range.
- They wreck habitat. Nesting tilapia strip aquatic plants and stir up sediment, and they out-compete and harass native fish for food and space.
The result: waterways that should hold bass, cod and barra end up carpeted in cichlids instead.
Why you can’t just throw them back
That mouth-brooding trick is exactly why the disposal rules are so strict. A female lifted from the water — or flicked back, or left flapping at the water’s edge — can spit out a mouthful of live eggs or fry. Release one fish and you can seed a whole new generation. Even a dead tilapia left near the water can drop viable young. That’s why the rule is simple: kill it, and get it well away from the water.
The rules: kill, don’t return, dispose away from the water
In Queensland, tilapia are a restricted noxious fish under the Biosecurity Act 2014. If you catch one, you are legally required to:
- Humanely kill it immediately — and never return it to the water, alive or dead.
- Dispose of it well away from the waterway — bury it above the high-water mark, or put it in a rubbish bin.
It’s also illegal to possess a tilapia (alive or dead), to use one as bait, or to release one into any waterway. Penalties for serious noxious-fish offences can run into the hundreds of thousands of dollars. Other states list tilapia as noxious too, so always check your local fisheries rules — the detail varies from state to state.
The cruel irony: a world-class food fish you can’t eat
Tilapia is one of the most farmed and eaten fish on earth — mild, white-fleshed and on menus worldwide. But because it’s a declared noxious species here, possessing one is an offence — so in Queensland you can’t legally take your catch home to eat. A clean, good-eating fish that, in this country, you’re required to kill and bin. That’s how seriously the damage is taken.
How to catch them
Don’t write tilapia off as sport — they’re aggressive, willing and surprisingly good fun on light gear. Better still, every one you remove is a win for native fish.
Where to find them
Warm, still or slow water: urban lakes and canals, weir pools, farm dams, drains, slow river bends and brackish estuary edges. Focus on the shallow margins and weed edges, especially in the warmer months when they’re on the beds — look for the saucer-shaped nests the males fan out in the silt, with fish hanging tight to them.
Gear
Light is right: a 1–3 kg spin outfit, small hooks (size 6–10), and light line and leader. They have small mouths, so scale everything down.
Baits
Bread is the classic — and it’s deadly. A pinch of white bread on a small hook, with a little bread berley to bring them in, is hard to beat. Worms, corn, dough and tiny pieces of prawn all work too. (Just remember you can’t legally hang on to them as bait afterwards.)
Lures & fly
Tilapia will smash small presentations, particularly nest-guarding males defending their patch. Try tiny soft plastics (1–2″), small blades and vibes, and little hard-bodies worked slowly past the beds. On fly they’re a genuine challenge and a lot of fun — small nymphs, wets and bread-flies sight-cast to fish in the shallows.
Sight-fishing the beds
The most fun way is to sight-cast: polarise up, walk the shallow edges, and pitch a small lure or bait at fish holding on the nests. They’re territorial, and a guarding male will often hammer anything that lands in his patch.
Do your bit
Every tilapia you legally remove is one less fish competing with the species that belong here — the Murray cod, barra, bass and the rest. It’s the same reason we keep an eye on the other big freshwater pest, the carp — Australia’s “mud marlin”. Catch tilapia, dispatch them properly, dispose of them away from the water — and keep chasing the homegrown species worth protecting.
Just don’t put one back. Ever.
Sources & disclaimer
This article is general information only and is not legal advice. Fishing, biosecurity and noxious-species regulations change over time and vary between states and territories. Always confirm the current rules with the relevant state fisheries or biosecurity authority before you fish, and make sure you comply — you are responsible for your own compliance with the laws that apply where you are. Outfished accepts no liability for any reliance on the general information in this article.
Sources (accessed June 2026):