Spangled Perch

Australia's most widespread freshwater fish turns up in desert waterholes, bore drains and flooded wheel ruts, and eats insects, shrimp and small fish.

Family

Terapontidae

Origin

Endemic

How to tell it

Stop at a waterhole almost anywhere in the northern two-thirds of Australia and there is a good chance of spangled perch in it. Fishes of the Murray-Darling Basin calls it the country’s most widespread native freshwater fish, and Fishes of Australia says it has the largest range of any freshwater grunter, through major rivers, isolated drainages and ponds across the north. It lives in places no other fish would bother with: bore drains, wells, farm dams, the last pool of a creek that has stopped flowing.

It is a small fish. Fishes of the Murray-Darling Basin gives a maximum of 33 centimetres and says most are about 15; a fish of 25 centimetres and half a kilogram is rare. It is silvery to bluish-grey, paler below, and covered in reddish-brown spots, which is where the name comes from.

Nobody drives to the outback for a spangled perch. But it lives across inland Queensland, the Northern Territory and the north-west of New South Wales, and anyone who puts a small fly in water there is likely to meet one.

The quick read

A tough, hungry, adaptable fish. Fishes of the Murray-Darling Basin lists its diet as aquatic insects, shrimp, tiny crustaceans and fish, with about a tenth of it plant matter, and says it can survive water up to 40 °C. Fishes of Australia adds that it can survive a waterhole drying up by aestivating, lying dormant until water returns.

Range in Australia

Most of the continent north of the cold. Fishes of Australia gives the range as the Murchison River in Western Australia across central and northern Australia to near Newcastle in New South Wales, and puts the southern limit down to the fish’s intolerance of water below about 5.3 °C.

In the Murray-Darling Basin, Fishes of the Murray-Darling Basin says it lives in the Darling catchment, except in the colder, higher country such as the upper Macquarie River. Fish sometimes appear in the southern Basin after floods, but they have not persisted there. The same source lists the species as declining in the Basin, with cold-water pollution below dams and reduced flooding in regulated rivers among the threats.

None of the waters in this guide currently carries a record of spangled perch; this guide’s catalogue is mostly southern trout and cod water, south of where the fish lives.

Habitat and behaviour

Everything wet. Fishes of the Murray-Darling Basin lists rivers, billabongs, lakes, isolated dams, bore drains, wells and waterholes in intermittent streams, and Fishes of Australia says it tolerates a wide range of salinity and temperature.

What it is famous for is getting around. Fishes of the Murray-Darling Basin says spangled perch are often reported in “rains of fishes”, and that the likely explanation is not that they fell from the sky but that they swam through overland water, sometimes only centimetres deep, after heavy rain. It records fish swimming across flooded paddocks and along wheel ruts on tracks for up to 16 kilometres. That is how a fish ends up in a waterhole with no creek leading to it.

Confusing species

The confusion is in the names. Fishes of Australia records a string of local names for spangled perch, among them bobby, nicky, jewel perch, spangled grunter and trout cod. That last one matters. The trout cod proper is, in Fishes of Australia’s account, an endangered cod of the south-east Murray-Darling and a member of a different family, and a report of a “trout cod” from a northern waterhole is almost certainly a spangled perch.

Otherwise, go by Fishes of Australia’s description: a silvery to bluish-grey grunter, paler below, covered in reddish-brown spots. If in doubt, compare a photograph with its species page before you report the fish.

Fishing for them

No fisheries source we read describes a fly method for spangled perch. What the sources do describe is the diet, and that is enough to choose a fly. A fish that eats aquatic insects, shrimp and small fish will take a small nymph, a small shrimp pattern or a small streamer.

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A three or four weight is plenty for a fish that is usually 15 centimetres.

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Small nymphs such as the Gold-Ribbed Hare’s Ear, small shrimp patterns (see scuds and shrimp) and a small Woolly Bugger cover the food.

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In a still waterhole, a small terrestrial on the surface is worth a try for a fish that eats insects.

Release the ones you do not need quickly, with wet hands.

Spawning season

Summer, after the water warms. Fishes of the Murray-Darling Basin says spangled perch breed from November to February, spawning at night in shallow backwaters or still pools once the water is above 20 to 22 °C, scattering small eggs over the bottom that hatch in about two days. A rise in water level is not needed, and they will breed in impoundments, but flooding helps by spreading the young.

They mature fast. The same source says males mature at about 58 millimetres and females at about 78, in their first year, and that a female carries between 24,000 and 113,200 eggs. That helps explain how the fish recovers so quickly when the rain comes back.

Rules that apply

Spangled perch has no species line of its own on the rules pages we checked. Check the current guide for the water you are fishing.

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Queensland: the Queensland Government’s freshwater page (last updated 27 March 2026) does not list spangled perch, and says a general possession limit of 20 applies to any freshwater species not listed.

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New South Wales: NSW DPIRD’s freshwater bag and size limits page, as checked in October 2026, has no line for spangled perch, so it falls under “other native fin fish species”: a bag and possession limit of 10, one or more species combined, open all year.

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Western Australia, the Northern Territory and South Australia set their own rules; check the current guide.

Frequently asked questions

Is a “trout cod” from a northern waterhole really a trout cod?

Almost certainly not. Fishes of Australia lists trout cod as one of the local names for spangled perch. The real trout cod lives in the southern Murray-Darling.

How did fish get into a waterhole with no creek?

By swimming there. Fishes of the Murray-Darling Basin describes spangled perch moving through shallow overland water after heavy rain, across paddocks and along wheel ruts, for up to 16 kilometres.