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Bite Compass
Estuary / River

Cobbler

Cnidoglanis macrocephalus

Estuary catfish with venomous dorsal and pectoral spines — handle with care. Decent eating despite its looks. Common bycatch on bait rigs in the Swan River and Peel-Harvey.

Size
Up to 91cm and 2.5kg, commonly 500g–1.5kg
Peak season
Year-round
Minimum size (WA)
43 cm
Bag limit (WA)
8 (catfish and estuary cobbler combined)

Overview

Cobbler are Perth's most underrated eating fish — ugly, spiny, and dangerous to handle, but surprisingly excellent on the plate when prepared correctly. These estuary catfish are found throughout the Swan River and Peel-Harvey system, and while they're usually caught as bycatch when targeting bream, some anglers specifically target them for a feed.

Identification

Also known as Estuary cobbler, estuary catfish

Unmistakable once you have seen one: a broad flat head, four pairs of barbels around the mouth, scaleless mottled brown-and-cream skin, and a long body tapering into a continuous fin fringe around an eel-like tail. The serrated spines at the front of the dorsal and each pectoral fin are venomous — the identifying feature that matters most. Do not confuse it with the fork-tailed marine catfish of northern WA, or with silver cobbler, a northern freshwater fork-tail sold as cobbler fillets and a different fish entirely. Eels have no barbels and no spines, which settles that one quickly.

How to Catch

Best Baits

Prawns, tube worms, fish pieces (mullet, herring), chicken

Lures

N/A — bait-only species. Cobbler feed by scent on the bottom and don't respond to lures.

Rigs

Simple running sinker rig or paternoster rig with a size 2/0–4/0 hook and enough weight to hold bottom. Use a sturdy leader (10–15lb) as cobbler have rough mouths.

Technique

Fish bait rigs on the bottom in estuary channels and deep holes. Cobbler are nocturnal scavengers that feed by scent, so fresh, smelly baits work best. Cast into deeper water near muddy or silty areas and wait — they'll find the bait. Use a rod holder and watch for the tip to pull down.

Best Time

Best after dark in the warmer months when cobbler are most active. Tide changes in estuaries concentrate them in channels and holes. They bite year-round but summer evenings are prime.

Size & Growth

A typical Swan or Peel cobbler is 40–55 cm and 500 g to 1.5 kg. A good one is 60 cm-plus, and DPIRD's recorded maximum of 91 cm and 2.5 kg is a headline rather than anything to expect. They take three to five years to mature at about 43 cm, live to about 13 years, lay few eggs and stay resident in the one estuary system, which is exactly why the Peel-Harvey and Swan populations were hit hard by commercial netting and have been slow to rebuild. Treat a big cobbler as an old fish. Realistically, a good night is two or three keepers in the 45–55 cm range, which is more than enough meat for a family.

Diet & Habitat

Nocturnal bottom feeders that hunt by scent and touch, sweeping those barbels over the mud for crabs, prawns, worms, molluscs and small fish. They hold in seagrass, muddy channels, weed banks and the deeper holes of estuaries, usually in 2–10 m, and will also work sheltered nearshore bays. Endemic to southern Australia. In WA that means the Swan-Canning, the Peel-Harvey, Leschenault, Hardy Inlet, Wilson Inlet and the sheltered coastal water between them. Around Perth the Swan around Bicton and Point Walter and the Peel channels are the productive ground, best worked after dark in the warmer months.

WA Size & Bag Limits

Minimum size 43 cm
Bag limit 8 (catfish and estuary cobbler combined)
Counts toward Counts within the statewide nearshore/estuarine finfish mixed daily limit of 16.

Minimum size: 43cm. Bag limit: 8 (covers catfish and estuary cobbler combined). Cobbler count within the statewide nearshore/estuarine finfish TOTAL mixed-species daily limit of 16.

Last checked . Limits change — confirm with DPIRD before you fish.

Eating Quality

Surprisingly good eating, and the most underrated fish in the estuary — provided you skin it before cooking, because the skin carries an unpleasant muddy flavour that will ruin the lot. Under it is white, firm, boneless flesh with no pin bones at all, which makes it one of the few WA fish you can hand a bone-wary kid without a second thought. Size barely matters; a big cobbler eats as well as a small one. It is excellent crumbed and fried, holds together in a curry or a chowder, and takes a hot BBQ plate without falling apart. The firm texture also means it freezes better than most estuary fish — skinned fillets keep a couple of months vac-sealed. Do not judge this fish by its looks.

Where to Catch Cobbler

Ashfield Flats (Swan River) Bicton Baths (Swan River) Coodanup Foreshore (Peel Inlet) Coode Street Jetty (South Perth) Denmark (Wilson Inlet / Ocean Beach / Lights Beach / Hay River) East Street Jetty (Swan River) Herron Point (Harvey Estuary) Kent Street Weir (Canning River) Leschenault Estuary (Bunbury) Murray River (Yunderup to Pinjarra) Narrows Bridge (Swan River) Peaceful Bay Pemberton / Donnelly River Point Walter (Swan River) Salter Point (Canning River) The Causeway (Swan River) Tranby Jetty (Maylands, Swan River) Walpole / Nornalup Inlet (Coalmine Beach / Mandalay Beach)

Guides Featuring Cobbler

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