June and July bring some of the coolest months of the year, a time when many anglers focus on bream, tailor, and snapper as the staple catches. However, there are two other species that thrive in our estuaries during this period—the mangrove jack and the jewfish.
For as long as I can remember, these two species have coexisted well and are often caught side by side. While mangrove jacks are commonly found in canal systems and the upper reaches of rivers and creeks during the warmer months, they return to the entrances of coastal bars, rock walls, and snag-filled areas as temperatures drop. Here, clean ocean water pushes in, and baitfish gather in large numbers, providing the perfect conditions for jacks and jewfish to bulk up.
Whether they arrive to breed or for other reasons isn’t entirely clear, but one thing is certain—some of the jacks caught during this time can exceed 4 kg in weight and measure over 68 cm in length.
TARGETING BIG JACKS AND JEWFISH
Mangrove jacks, part of the Lutjanus family, are formidable sport fish that demand serious tackle. Larger specimens require at least 40 lb braid, a 60 lb leader, and a PE3 spin or overhead setup. The recommended hook is a solid 5/0, with just enough weight to get your live bait to the bottom—heavy enough to sink but not so much that it snags instantly.
The key is to use just enough weight so that the fish doesn’t feel the resistance when it strikes.
Jewfish have a similar hunting style but tend to go after larger prey such as mullet or legal-size tailor. However, it’s not uncommon to see metre-plus jewfish aggressively chasing smaller yellowtail (yakkas) or similar baitfish. Fortunately, the same tackle setup works for both jacks and jewfish, meaning there’s no need to constantly switch gear—just ensure your drag is properly set and pay attention to water colour, as it plays a crucial role in a successful day.
BEST CONDITIONS AND TECHNIQUES
I prefer to fish during the first stage of a tide change—whether the tide is running in or out—as long as there’s turbulent water and a current line forming around rock walls or submerged structures. These “pressure points” create pockets of slower moving water where fish conserve energy while waiting to ambush prey. Position your boat on the edge of this current line and drop your bait straight down rather than casting. Casting can cause your sinker to plunge directly into snags, reducing your chances of a clean hookup.
Fishing with a vertical setup is far more effective.
Ideally, catching live bait from the same area you’re fishing will improve your chances, but oceangoing live baits like yellowtail/yakkas are perfect alternatives. Herring can be a bit small and may struggle with a double hook 5/0 rig, while mullet also work well—just ensure they aren’t too big for Jacks to take in one strike.
A bit of rain can also work in your favour. When fresh water pushes baitfish out with the currents, it creates a feeding frenzy, making conditions ideal for targeting both species. Be aware, though—sharks also show up in numbers during these periods, often becoming a major problem for anglers trying to land their catch.
SCORE THE TRIPLE J
So, when the water and weather cool, try for a double header—a jewfish and a jack. And if you land them in June or July, congratulations—you’ve scored the Triple J!
See you at the Sanctuary Cove International Boat Show and be sure to come up and say g’day!
Published in print April-July 2025
