Rankin cod are a hard-hitting reef fish from the north-west and they punch well above their weight once hooked. They are popular because they live on good country, eat well and pull like a proper reef brute.
In Australia you mainly find them off the north-west coast, especially around WA offshore reefs, ledges and rubble ground. They hold over hard bottom in moderate depth, often around reef edges, bommies and broken country where bait stacks up.
They are classic ambush feeders, eating smaller fish, squid, crabs and other reef life. Most of the time they sit tight to structure, then rush out and smash an easy meal, especially when bait is pushed across the reef.
Tide matters because a bit of run usually gets them active, especially around reef edges and pressure points, but too much flow can make them harder to hold on properly. Low light around dawn, dusk and overcast periods often helps, as these fish will move a little freer off the structure to feed. Light to moderate wind is usually best because you can stay on the mark and fish cleanly, while strong wind makes boat control and bait presentation tough. Smaller to moderate swell is ideal offshore, and once the swell gets up it becomes harder to fish the reef accurately and the bite often drops with it.
Use solid reef gear with a short, heavy leader because the first few seconds are all about turning their head before they brick you. Large paternoster or running sinker rigs work well with fresh squid, mullet, pilchard or strip baits, and knife jigs can be deadly when they are sitting under bait schools.
Rankin cod are often so structure-focused that if you do not stop the first dive, they can have you buried in the reef almost instantly.