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Bite Compass
Freshwater

Rainbow Trout

Oncorhynchus mykiss

Rainbow trout fishing in WA's south-west — the introduced salmonid stocked into Wellington Dam, Drakesbrook Weir, Waroona Dam and the Pemberton and Donnelly streams every cooler season out of DPIRD's Pemberton hatchery. A cool-water species, so the fishery runs autumn through spring, not summer. Smaller and milder than Atlantic salmon, and excellent smoked or pan-fried.

Size
Up to 4kg, commonly 300–600g
Peak season
Apr–Oct (cooler months)
Minimum size (WA)
30 cm
Bag limit (WA)
4 (combined freshwater bag)

Overview

Rainbow trout are the mainstay of WA's south-west freshwater scene — not native, but stocked into the cool dams and forest streams every year out of the DPIRD trout hatchery at Pemberton. Recfishwest and DPIRD coordinate the annual release programme with industry partners, including the Alcoa-supported Troutfest at Drakesbrook Weir and stocking events at Wellington Dam, Waroona Dam, Harvey Dam and the Collie and Brunswick rivers. The Pemberton and Donnelly catchments hold the more natural stream fishery, where wild-living rainbows mix with recently stocked fish. A South-West Freshwater Angling Licence is required, and the cooler months are when the fishery genuinely fires.

Identification

Also known as Rainbow, rainbows, bows

Silvery-olive with a rose-pink band running down the flank from gill cover to tail, and heavy black spotting scattered over the back, the dorsal fin and — the key detail — right across the square tail. A brown trout tail is largely unspotted, and that alone separates the two in the net. Browns are also more golden-brown with red or orange spots ringed by pale halos. Both carry the small fleshy adipose fin behind the dorsal, which redfin do not. Fresh-released stocked fish look pale and washed out with rounded, worn fins and no real pink band; they colour up over a few months.

How to Catch

Best Baits

Scrubworms, garden worms, PowerBait dough (in dams), mudeyes under a float, small yabbies

Lures

Small spinners (Celta, Mepps Aglia), small hardbodies (Rapala CD-3, Daiwa Double Clutch), 2–3" soft plastics on 1/16–1/8oz jigheads, dry and wet flies

Rigs

Light spin gear — 4–6lb mono or 8lb braid with a 6lb fluorocarbon leader. Running sinker rig with a size 8–12 baitholder or single hook for bait. Fly anglers run 4–6 weight rods with floating lines on the streams, sinking lines in the dams.

Technique

On the dams, cast small lures along weed edges, drowned timber and inflow points, and work them with a slow steady retrieve. Trolling small hardbodies behind a kayak or electric-powered tinny is the classic Wellington approach. On the streams (Donnelly, Warren, Lefroy Brook), short-line nymphs or small dry flies work the runs and pools — fish wild but lightly. Bait fishing on the bottom near inflows produces fish for those who prefer to sit and watch a rod tip.

Best Time

April through October is the productive window, with the cooler water of June–September the standout months. Stocking releases occur in the cooler season and fresh-released fish bite freely for the first few weeks. First and last light are best on the dams; overcast and drizzle outproduce bright sun.

Size & Growth

Most WA rainbows are 300–600g and 25–35cm, which is roughly what a stocked fish reaches in its first season or two. A kilo is a good fish, and Wellington Dam holdovers that survive a couple of summers reach 2–4kg. The honest picture is that this is a put-and-take fishery for the most part: summer water temperatures in the south-west kill off most of each release, so the average size stays modest and reflects how recently a water was stocked rather than how good the water is. The stream fish in the Pemberton and Donnelly catchments run smaller but fight better.

Diet & Habitat

Aquatic insects, mudeyes, gilgies and small yabbies, worms, terrestrial insects blown onto the water, and small fish once they get some size on. They need cool, well-oxygenated water and hold near inflows, weed edges, drowned timber, submerged points and the pools below stream riffles, going deep as the dams warm up. The WA fishery is the stocked south-west: Wellington Dam, Harvey Dam, Waroona Dam, Drakesbrook Weir and Big Brook Dam for the still water, and Lefroy Brook, the Warren and the Donnelly for the stream fishing out of the Pemberton hatchery programme.

WA Size & Bag Limits

Minimum size 30 cm
Bag limit 4 (combined freshwater bag)
Counts toward The statewide freshwater finfish bag of 4 is shared across the whole category — rainbow and brown trout, catfish and freshwater cobbler, and the freshwater striped perch such as sooty grunter. A South-West Freshwater Angling Licence is required (under-16s exempt), and the Shannon River and Water Corporation drinking-water dams are closed to fishing.

Bag limit: 4 freshwater finfish combined — the statewide freshwater mixed bag covers rainbow and brown trout, catfish and freshwater cobbler, and the freshwater striped perch (sooty grunter and relatives), not just the trout. Minimum size: 300mm. A South-West Freshwater Angling Licence is required (under-16s exempt). The Shannon River and Water Corporation drinking-water dams are closed to fishing.

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

Eating Quality

Yes — rainbow trout is good eating: pink-orange flesh, mild and clean, with none of the muddiness that comes off warm-water natives. The easiest path is whole — gut it, score the sides, stuff the cavity with lemon and herbs and bake at 200°C for 15–20 minutes; or fillet it and pan-fry skin-side down in butter for three or four minutes a side. It also hot-smokes beautifully, which is the best use of a few fish at once. It is leaner and milder than the farmed Atlantic salmon it gets compared with, so it dries out faster — pull it off the heat while the centre still looks slightly underdone. Bleed on capture and keep it cold. Stream-caught wild fish are generally rated above freshly stocked dam fish on the plate, which have a softer, blander flesh. Freezes poorly; eat it within a couple of days.

Where to Catch Rainbow Trout

Big Brook Dam (Pemberton) Glen Mervyn Dam (Collie) Harvey Dam Logue Brook Dam (Lake Brockman) Pemberton / Donnelly River Waroona Dam / Drakesbrook Weir Wellington Dam (Collie)

Guides Featuring Rainbow Trout

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