Flathead
Estuary / RiverFlathead are ambush predators that lie half-buried on sandy and muddy bottoms throughout Perth's Swan River, Mangles Bay and the Peel-Harvey. WA's flathead are mostly southern blue-spotted and sand flathead — not the east-coast dusky — and they're one of the easiest soft-plastic targets going. Bounce a plastic along the bottom and hold on for the thump.
Overview
Flathead are one of Perth's most accessible estuary species — found on sandy and muddy bottoms throughout the Swan River and sheltered bays. They're ambush predators that lie half-buried in the substrate waiting to pounce on passing prey. Soft plastic fishing for flathead is one of the most effective and enjoyable ways to fish Perth's estuaries.
Identification
Flatty, southern blue-spotted flathead, sand flathead, bar-tailed flathead, lizard
Unmistakable once seen — a flattened wedge-shaped head, eyes set on top, and a long tapering body built to lie buried in sand with only the eyes showing. Sandy to mottled brown above, white below. WA's common estuary species are the southern blue-spotted flathead, which carries blue spots on the body and tail, and sand flathead; bar-tailed flathead take over further north. The east coast's dusky flathead — the one that grows to a metre and has slot limits in Queensland and NSW — isn't the fish you're catching in the Swan. Watch the sharp spines on the gill covers when you unhook them.
How to Catch
Whitebait, prawns, small mullet, squid strips
Soft plastics are king: 3–4 inch paddle-tails (Z-Man MinnowZ 3", Gulp 4" Minnow in pumpkinseed or nuclear chicken) on a 1/4–3/8oz jig head. Gulp 3" Shrimp on a 1/6oz head is deadly over the flats. Metal blades (Ecogear ZX40, Samaki Vibelicious 70mm) work when you need to cover ground or sound the bottom in deeper channels.
For bait, a running sinker rig with a size 2/0 hook and enough weight to hold bottom. For lures, a 1/4–3/8oz jig head matched to a 3–4 inch paddle-tail soft plastic. Use 6–10lb fluorocarbon leader.
Cast soft plastics or bait across sandy flats and work them slowly along the bottom with a hop-and-drop retrieve. The key is keeping contact with the bottom — flathead won't chase far from their ambush position. Cover plenty of ground, fan-casting to locate fish. The hit is usually a sharp thump followed by a head-shake.
Active throughout the day, with a slight edge at dawn and dusk. Tide changes that flush baitfish across the flats are ideal. Work the edges of channels and drop-offs where flathead sit waiting for food to wash past.
Up to 5kg, commonly 500g–1.5kg
Year-round
Size & Growth
A typical Swan or Peel flathead is 30–40 cm and 400–800 g. A good one is 50 cm and over a kilo; the 5 kg headline size is a genuinely big fish and not something metro estuaries produce often. WA's estuary species simply don't grow to the size of the east coast's dusky flathead, so calibrate your expectations accordingly — a 60 cm WA flatty is a very big fish, not a starting point. The big ones are almost always females and are slow to replace, so there's a reasonable argument for photographing the standout fish rather than filleting them.
Diet & Habitat
Ambush predators — they lie half-buried and lunge upward at prawns, small mullet, hardyheads, whitebait, crabs and anything else that passes overhead. They sit on sand and mud, especially where sand meets weed, along channel drop-offs and up on the shallow flats on a rising tide, from ankle-deep out to 20 m or more. In WA the estuary species range down the west coast and along the south coast, with the Swan River from Fremantle up to the Narrows, Mangles Bay, Cockburn Sound and the Peel-Harvey the reliable metro ground. Bar-tailed flathead take over in the north of the state.
WA Size & Bag Limits
| Minimum size | 30 cm |
|---|---|
| Bag limit | 8 |
| Counts toward | Counts within the statewide nearshore/estuarine finfish mixed daily bag of 16. No slot limit applies in WA. |
Minimum size: 300mm. Individual daily bag limit: 8, counted within the statewide nearshore/estuarine finfish total mixed bag of 16 per fisher — so eight flathead leaves room for eight other nearshore fish. WA has no slot limit like Queensland's.
Eating Quality
Yes — flathead are some of the best eating in Perth. Firm, white, mild fillets with a clean flavour and, once you're past the head, almost no bones to pick around — the gun choice for fish and chips. Fillet and skin them, and take the cheeks out of the head while you're there; they're the best mouthful on the fish. Bigger fish over about 45 cm give thick fillets worth pan-frying in butter or grilling; smaller ones are better crumbed or battered. The flesh is firm enough that it won't collapse in a curry or a chowder either. Bleed and ice them and eat within a day or two — flathead softens noticeably after that. They freeze better than most estuary fish if skinned, portioned and vac-sealed, though frozen fillets are best crumbed.
Perth Tips
The Swan River from Fremantle to the Narrows, Mangles Bay, and the Peel-Harvey are top flathead spots. Watch for sharp gill spines when handling — use a lip grip. Flathead often lie on the edges of sand and weed, so work your lure along these transitions.