The fish
Black marlin are among the largest and most powerful billfish in the world. Females, considerably larger than males, can exceed four metres and 600 kilograms, and the biggest fish taken off Cairns regularly top 1,000 pounds. Their broad, rigid pectoral fins, which cannot be folded flat against the body as other marlin species can, are one of the clearest ways to identify them at the boat.
A marlin over 1,000 pounds, roughly 450 kilograms. It is the fish every big-game angler hopes for, and the Ribbon Reefs off Cairns are where most of them have been caught.
The fishery
Tropical North Queensland has been synonymous with giant black marlin since the fishery was developed in the 1960s and 70s. The first grander, a fish over 1,000 pounds, was landed off Cairns in the mid-1960s, and the great majority of grander black marlin ever weighed anywhere in the world have come from these waters.
The reason is geography. The narrow shelf between the reef and deep water means giant black marlin, migrating through the Coral Sea to spawn, funnel along a compact stretch of the Ribbon Reefs each spring rather than dispersing across open ocean.
On the map
Ten reefs running north from Cairns to Lizard Island, where the giant black marlin funnel each spring.
Tap a stop to find it on the map
Locations are indicative and not for navigation.
Season
The giant black marlin run builds through spring, with smaller juvenile fish inshore ahead of it and reef and bluewater species all year.
Numbers and size build to a November and December crescendo. IMPULSIVE debuts in September 2027, and the juvenile marlin months are bookable from 2028.
Technique
Grander-class fish
Juvenile fish inshore
Every billfish is tagged and released, the Tropical North Queensland standard since the 1970s and a conservation ethic that has helped sustain the fishery for more than fifty years. IGFA-compliant tagging and weighing is available on request.
Fish it from IMPULSIVE
Paired with a dedicated heavy-tackle game boat, IMPULSIVE works the Ribbon Reefs through the 2027 season, holding position near the fishing and moving along the reef as the fish move.
See the sample itineraries or read how mothershipping works.
In plain English
A marlin over 1,000 pounds, roughly 450 kilograms. Tropical North Queensland has produced the great majority of grander black marlin ever weighed.
Strong rods and line, typically 130 and 80 pound outfits, used to troll the reef edge for the largest marlin.
Lighter rods and line for smaller fish such as juvenile marlin, giant trevally and reef species. More technical, and suited to all levels on the reef.
Towing lures or rigged baits behind a moving boat. It is the traditional way to fish for marlin along the reef edge.
Every billfish is tagged and released alive, the Tropical North Queensland standard since the 1970s.
The International Game Fish Association, which sets the rules for recognised catches. IGFA-compliant tagging and weighing is available on request.
The luxury yacht, here IMPULSIVE, where guests sleep, dine and relax. She holds position close to the fishing grounds, so there is no daily run back to port.
A purpose-built fishing boat with its own captain, mate and deckhand, dedicated entirely to the fishing.
Keep exploring
Availability for the 2027 season is limited, and 2028 forward bookings are also open. Tell us your dates and whether you have a game boat booked.
Enquire about black marlinEmail us
Prefer to talk? Call 1300 424 278 or email info@charteryacht.com.
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