How to Catch Cobia in Australia: Live Bait, Jigs and Downrigging
Cobia deserve an outfit of their own. Find bait around reef or wreck ground, put a lively bait or suitable jig through the fish's depth, and have the landing gear ready before anything happens. The last part becomes surprisingly urgent when a big one arrives.
I learned that again in Hervey Bay in October 2023. A few light marks in twelve metres persuaded me to drop a 100g jig on the light 702 outfit I had picked up. About three retrieves later, I was attached to a very large cobia. Forty-five minutes later, a shark ended the argument. The jig had done its job. I had given myself far too little control over what happened next.
There are better ways to plan the encounter. These are the decisions behind our own trips and the useful reports customers have sent in, from northern NSW to tropical Queensland.
Find the bait, then look through the whole water column
Cobia, also called black kingfish, are a different species from yellowtail kingfish. Look for the broad, flattened head, long body and dark back with pale flanks. They resemble remoras, but have no sucking disc on top of the head. The Fishes of Australia species account describes their tropical and subtropical distribution, reef-associated habitat and diet of fish, squid and crustaceans.
Start around ground that holds food: inshore reef, wreck edges and concentrated bait. Search with the sounder, but keep someone watching the surface too. Cobia can appear high in the water, including alongside large rays and sharks. Leave wildlife undisturbed and have a cast-ready lure or bait available rather than trying to rig while a fish passes the boat.
Give a productive bait ground a proper look
At McCauley's Reef near Coffs Harbour in March 2019, Rob Stokes and I found bait everywhere, with larger arches among it. Other crews filled their tanks and left. We decided to fish there first, sending a large live slimy mackerel down to ten metres on the downrigger.
The first fish was a tuna, followed by mackerel later in the session. Rob returned after our visit and reported a 15.2kg cobia on his Bay Jig outfit. The useful lesson is that a bait ground can also be a predator ground. Read One Flash and Your Bait's Slashed for the complete sequence.
Mark the depth of the bait and larger returns. Make a controlled pass or drift that puts the presentation through that band. If the screen goes quiet, search around the edges or move to the next useful patch. Repeating a familiar track through empty water rarely improves it.
Timing depends on the region
Our NSW North Coast examples include the March Coffs Harbour trip and Justin's report published in February 2026. Simon Fleming also sent a Broughton Island report in April 2025, with a 14.5kg cobia on a live slimy. Those dates give you local leads to investigate, not an Australian season calendar.
Queensland examples span different waters and times of year: my October Hervey Bay trip, and the Reads' reef and wreck fishing off Mission Beach. Check recent local reports, water conditions and bait presence for the region you are actually visiting. The species is uncommon in temperate Australian waters; an occasional southern catch is not a reason to promise a reliable local run.
Choose tackle that can finish the fight
For deliberate cobia fishing, a capable 20-24kg class outfit is a sensible starting point, with more capacity and power needed for very large fish or difficult structure. Match the rod, reel, line and drag as a system. A heavy line on a light rod does not turn it into a heavy outfit. For jigging, the rod also needs to work the chosen lure weight comfortably; check its stated jig range as well as its line rating.
For live bait, start with a strong mono or fluorocarbon leader suited to the bait and abrasion risk. Around 60-100lb is a practical starting range for substantial fish, adjusted for local conditions. Check the leader after every encounter with reef, the boat or a fish. Use the braid, mono and leader guide if you are balancing depth control against abrasion resistance.
Choose a strong hook with enough gape to remain clear of the bait. My yellowtail rigging instructions demonstrate a 6/0 short-shank hook; that is an example for the bait shown, not a compulsory cobia hook size. Small yellowtail and large slimies need different judgement. Sharpen or replace a damaged point and inspect the entire connection, including assist cord and rings when jigging.
Set a smooth working drag within the outfit's limits before fishing. Keep enough line in reserve for depth and a sustained run. Reel size numbers vary between manufacturers, so actual line capacity and usable drag matter more than the number on the spool.
Light tackle has caught impressive cobia. It has also cost me fish and gear. In the February 2026 report I described losing a big Cooktown fish after the reel, rod and line failed in sequence. I had chosen the outfit. Blaming the fish would have been a bit rich.
Rig a lively bait and choose how to deliver it
Slimy mackerel and yellowtail are useful starting baits in the NSW examples. Simon's Broughton fish took a live slimy, and our older Hat Head account records a cobia on yellowtail fished near the bottom with a heavy mono leader. You do not need a downrigger to fish a bait at depth from a controlled drift or a suitably positioned anchored boat.
Keep the bait alive and swimming properly. Have clean, circulating holding water ready, avoid overcrowding and rig promptly with wet hands. The yellowtail and slimy mackerel guide covers catching and holding them.
For slow trolling, I use the bait-needle and small-band method shown in the live-bait rigging guide. The band passes through the tough tissue in front of the eye sockets, avoiding the eyes, and the hook locks into the exposed loops. The hook point and gape stay outside the bait.
Watch the bait beside the boat before lowering it. If it spins or rolls, fix the rig or replace the bait. Use a pace that lets it swim naturally. Speed over the ground alone cannot tell you how hard a bait is working against the current.
- Fish visible near the surface: a freely swimming or lightly weighted bait may be enough. Cast or place it ahead of the fish's path without landing the rig on its head.
- Fish holding over one patch: control the drift or boat position and use enough weight to reach the depth without losing track of the bait.
- Bait and predators spread along a route: a downrigger can keep a bait at a chosen depth while you search.
Watch the rod, line angle and sounder together. Check a bait that stops behaving normally. A rig swimming neatly at the start can become damaged, tangled or exhausted later.
Use a downrigger when depth control earns its place
The downrigger carries a release to depth while the fishing line and bait trail behind it. After the line releases, the rod and reel fight the fish without the weight attached. That gives you a way to fish below surface baits while covering ground.
In Downrigging Cobia, published in February 2026, Justin reported ten cobia on the NSW North Coast, nine caught using his downrigger. He also described many lost fish and trouble with sharks. It is a useful report of what depth control did for his fishing, not a prediction of the catch you will make.
Make the first pass a controlled one
- Choose a route clear of reef, moorings, other boats and swimmers. Know the shallowest part of the pass before lowering the weight.
- Check that the bait swims straight, then let it back far enough to work clear of the downrigger gear. More setback needs more turning room.
- Load and test the release as directed for that model. Lower under control while paying out the fishing line, watching for tangles and an unexpected release.
- Set the presentation at the depth holding bait or predators, with clearance over the bottom. Cable blowback means cable paid out is not always the same as vertical depth.
- Watch the rod and sounder during the pass. Retrieve before entering shallower water or making a tight turn, and clear the weight promptly when a fish is hooked.
The downrigger setup guide explains the full sequence. The current manual downrigger is the relevant equipment if this controlled trolling approach fits your boat and fishing.
Keep the two rubber-band jobs separate
A band used to attach a hook to a live bait is doing a different job from a band used at the downrigger release. The first rigs the bait. The second affects how the fishing line disconnects from the downrigger.
Justin reported fewer hookups after losing his clip and switching to rubber bands, and said coincidence might explain it. That is no reason to promise a perfect clip hookup rate. Test the release with your line, bait, rod load and speed. It should hold during normal deployment and let go predictably when required. The release-clip guide covers the checks.
Jig the fish's depth, with a lure you can control
My Hervey Bay cobia took a 100g jig in only twelve metres. Depth alone does not dictate jig weight. Current, drift, line diameter, lure shape and the way you want to work it all matter.
At the other end of the scale, Cameron and Hamish Read's October 2017 Mission Beach report described a trip using 40g jigs, octopus-style lures and plastics. They found cobia around the Black Pearl wreck and brought five to the boat, with the two largest reported at 1.1 and 1.3 metres. Their account supports carrying small lures, with tackle still capable of handling the fish that eats one. The original report did not assign a lure to every individual cobia.
Start with a jig that reaches the marked fish before the drift carries it away. Work controlled lifts and falls through that band, staying in touch well enough to notice a bite on the drop. Vary the pace and pause length if fish follow without committing. Once the lure is well clear of the useful depth, reset the drift rather than spending the whole day winding through empty water.
If the line sweeps away and the jig misses the marks, move heavier or improve the drift. If a lighter lure reaches cleanly, there is no need to make every drop harder work. The jig-weight guide and 40g micro-jigging guide explain those decisions.
Check the hook and connection as carefully as the lure. A strong, compact assist that hangs freely is a useful starting setup. Keep the point clear of the jig and leader; inspect cord, solid ring and split ring after a hard fish. See the assist-hook rigging guide. Our 100g knife jigs are one weight option, not a fixed answer for every depth.
Have another outfit ready when a cobia follows a hooked fish. Hamish reported that happening off Mission Beach in June 2018. Keep the spare lure clear of the hooked fish and the person preparing to land it. Landing one safely comes first.
Plan the landing, release and rules before the bite
Clear loose hooks and other rods from the working side. Have a large enough landing net, pliers and cutters within reach, and agree who is handling the boat and the fish. Use steady pressure and sensible boat handling to shorten the fight. Avoid a steep rod angle when the fish is close and do not wrap leader around a hand.
For a release, keep the fish in the water where practical. If you lift it for a quick photograph, support its body with wet hands; do not suspend a large cobia by the jaw, gills or line. A gaff is unsuitable for a fish you intend to release. If a deeply lodged hook cannot be removed without more damage, cut the line close to it. Queensland's responsible fishing guidance covers these handling decisions.
When sharks begin taking hooked fish, move a substantial distance or change the fishing plan. Repeatedly losing fish is a reason to leave. My Road Trip North account is a fairly convincing illustration of why.
NSW and Queensland have different limits
NSW: the current saltwater table lists no minimum legal length for cobia and a bag limit of five. Pay the recreational fishing fee unless exempt, and check local closures and marine park zones before collecting bait or fishing.
Queensland: the current tidal-water rules specify a 75cm minimum and possession limit of two cobia. Possession includes fish kept at home; it is not a fresh allowance each day.
Check the Solitary Islands Marine Park zones around Coffs Harbour, the current Great Sandy maps around Hervey Bay, and the applicable local zoning wherever else you fish. Historical reports do not establish present-day access. Elsewhere in Australia, use that state's current rules.
Keep the next bait or jig ready, check the leader after a fish and make the next pass only when the boat and crew are ready for it.