Alcoa Jetty in Kwinana is one of the few spots in Cockburn Sound where you can access genuinely deep water from the shore. The industrial jetty pylons create massive structure in deep water, and big pink snapper hold around the end of the jetty and along the pylon line. It's not pretty, but it's productive.

Fish heavy rigs with fresh bait (whole squid, mulies, or octopus) tight to the pylons for snapper. The deeper water means you need enough weight to hold bottom in the current. Dawn and dusk sessions are most productive, but snapper also bite well at night. Berley helps draw fish to your section of the jetty.

Pink snapper (the main target, big fish around the pylons), mulloway (at night, deep water), herring, and tailor.

Access to this jetty can be restricted — check current access arrangements before driving out. The industrial setting means it's not scenic, but the fishing makes up for it. Heavy tackle is needed here — this isn't light-tackle territory. Check DPIRD snapper bag and size limits before you go.