The Bonney Upwelling makes Portland different
From late November to April each year, the Bonney Upwelling pushes 14–16°C deep ocean water up onto the Portland shelf. That cold clear water brings krill, baitfish, and behind them: bluefin tuna, mako sharks, big snapper and kingfish. Portland in summer is the closest thing Victoria has to genuine open-ocean gamefishing, and the season runs almost six months.
BayCast tracks the live wind and swell for every launch on the Discovery Coast so you can pick the 3–4 days a fortnight when the offshore run is actually safe.
Where to fish the Discovery Coast for what
Southern bluefin tuna: Portland canyons offshore, December–April. Mako shark: 30 nautical miles southwest of Portland, January–March. Snapper: Portland Bay, Cape Nelson, October–December. King George whiting & squid: Portland Bay, year-round, peak summer. Mulloway: Glenelg River at Nelson — November–March on the run-out tide. Australian salmon: Narrawong surf beach, May–September.
Cape Bridgewater & Cape Nelson — open ocean
Both capes face genuine Southern Ocean swell — 1.8 m is a calm day. You need light winds (under 12 kt, ideally W or NW) and swell under 1.5 m for either to be tenable. Cape Nelson sits in the lee of any northerly so it's the more workable of the two when the high is sitting over central Victoria.
Wind direction cheat sheet for Portland
- Light NW or N under 12 kt: the dream day. Tuna offshore, Cape Nelson and Bridgewater both fishable.
- NE 10–15 kt: Portland Bay sheltered. Cape Nelson lee of cliffs. Cape Bridgewater no.
- S or SW 15+ kt: entire coast unfishable offshore. Inside Portland Bay still possible. Try Glenelg estuary.
- SE 15+ kt: Bridgewater unfishable. Portland Bay sheltered for a couple of hours.
- E 15+ kt: Portland Bay surf hits the wall. Cape Nelson works.
Bar crossings on the Glenelg
Nelson sits 4 km up the Glenelg River from the bar. The bar is fickle — mostly closed to recreational craft after any decent southerly swell. Mulloway and bream are the estuary targets and the river fishes well from Nelson upstream regardless of the bar status. Always launch inside the river mouth, not from the bar itself.
The Portland tuna ritual
Old-school Portland tuna trip: drive Friday afternoon, fish Saturday and Sunday, drive home Monday. The Portland tuna fleet runs out of Portland harbour to the canyons (10–25 nautical miles offshore depending on the year). Wind tolerance for the run is 15 kt or less with under 2 m swell — and you want that for at least 36 hours so the residual swell knocks down before you get out there.