Fly fishing for Giant Trevally in Seychelles and St Brandon’s Atoll
Dubbed “the gangsters of the flats” and for good reason. The Giant Trevally is arguably the most exciting fly-fishing target found on the shallow water flats of Seychelles and St Brandon. Encountered in a multitude of fly fishing scenarios including wild surf zones, white sand and turtle grass flats, the species has earned a reputation for being one of the most sought-after saltwater gamefish the world over.
A trophy fly caught Giant Trevally from the flats of Providence Atoll, Seychelles.
Fast facts:
- The Giant Trevally is the largest of the trevally species with the all-tackle world record weighing 72.80kg caught in Japan. We typically encounter the species in the range of 70 – 130cm on the flats and consider a GT of 100cm plus to be a trophy that weighs in the region 19kg.
- The species is an apex predator and opportunistic hunter that will prey on a range of food items including small fish, crustaceans, squid, birds, small turtles, and even juvenile dolphins.
- The most popular fly patterns for Giant Trevally represent small baitfish, squid, or crustaceans. The most important ingredient to a successful fly pattern however is the quality of the hooks used. Poor quality hooks will open because of the pressure applied to the fish during the fight and is done in an attempt to stop the fish before it reaches the numerous coral heads found on/near the flats of Seychelles and St Brandon’s Atoll.
St Brandon’s Atoll is renowned for its population of trophy GTs.
Rigging up for Giant Trevally
- The best fly rods for Giant Trevally are 9-foot 12wt fast action saltwater fly rods. – We recommend 9ft 12wt G.Loomis NRX.
- The best fly lines for Giant Trevally are 12wt Tropical/Warm water fly lines to match the recommended rod – Our choice is the Airflo Superflo Ridge 2.0 Flats Universal Taper.
- The best reels for Giant Trevally should have the following features: fast line retrieval, a drag system designed to handle wet wading in salt water, and a minimum backing capacity of 300 yards of 80lb gel spun or casting braid. – Our top pick is the WADE Caranx which was designed to handle fish of this nature effectively.
- Leaders for Giant Trevally are a simple 8-9ft of 130lb or 1mm soft monofilament. The leader is joined to the fly line with a loop-to-loop connection, the perfection loop is our knot of choice on the leader end. Our preferred knot to the fly is the Improved Homer Rhode Knot which is a non-slip loop knot.
- The best flies for Giant Trevally include GT Tan brush fly, GT Black brush fly, Olive Semper, and Black & Purple Semper. All tied on size #6/0 Gamakatsu SL12S hooks.
The ultimate fly fishing setup to take on Giant Trevally on the flats.
How to catch more Giant Trevally and make the most of your time on the flats
At home
Prepare – Practice casting with a 12wt before your trip
One of the most important elements of a successful fly fishing adventure to the wild flats of Seychelles or St Brandon’s Atoll is your ability to deliver the fly to your target species at short notice.
Practice your casting at home or with a casting instructor before your trip with us. 12 weight fly rods and large flies make casting challenging at the best of times. This single yet hugely important thing you can do before your trip will add huge value to your fly fishing experience on the flats.
On the flats
Presentation
A FlyCastaway guest casts a fly towards a free swimming Giant Trevally in Seychelles.
Fly fishing in saltwater exposes anglers to a world of moving targets. Few fish will stay stationary for very long. Giant Trevally are often found while on the move and the trick here is to imagine that you’re trying to throw and hit someone running across your garden with a tennis ball. After one or two attempts you’ll realise that you need to aim a yard or two in front of your moving target to hit it. The same principle applies while fly fishing for GTs. You will see the direction the fish is moving and you want to land your cast 15ft in front of the fish. You must factor in the speed at which the fish is moving to complete this correctly. The ideal presentation is completed when you have given yourself time to allow the fish to swim onto the fly before it recognizes it as a potential prey item. You can then begin with a long slow/medium retrieve while watching the fish’s body language. The moment the fish begins to speed up towards your fly, you should speed up your retrieve to long and fast. When done correctly you will notice a far greater success rate fly fishing on the flats for Giant Trevally.
Get into more successful positions
A FlyCastaway guest moves to intercept a school of GTs.
Fly fishermen who catch a lot of fish all have one thing in common. They do what they can to limit the number of variables in the process of catching a fish to a minimum. The KISS principle or (Keep It Simple Simon) should be applied to your fly fishing and especially while on the hunt for Giant Trevally. If you have spotted the fish in time and the angle of the wind or the distance to the fish is too great, move your position so that you either close the distance between you and the fish or change the angle of the wind so that you’re able to complete the correct presentation. Sometimes all it takes is a couple of steps to your left or right to make the cast that little bit easier.
Line management
A FCA guest clears his line following a successful hook-up.
Be aware of where your line has gathered on the sand, in the water, or on the boat. It may seem like a chore to continually manage your fly line but after a while it will become second nature and you will find yourself doing it without giving it much thought. Making sure your fly line is free of potential snags like your feet, coral, or a latch in the boat is often the difference between completing your dream catch or watching it swim by.
Explore
A FlyCastaway guest picks a trophy Giant Trevally from a large school of GTs on the flats of Providence Atoll, Seychelles.
One of the greatest things about flats fishing in the Indian Ocean is the freedom to explore some of the most pristine and abundant fisheries on the planet. For most of the day, you will be on foot, on the flats, or an island; use your intuition, your guide has chosen the area that you are fishing at that time of the day for a reason. He knows fish will be about, if you see something that looks good or “fishy” move to it, watch it, and make a cast or two if you are not sure. The number of trophy Giant Trevally landed by guests who have had a “feeling” and wandered off to investigate is high and proves that those who have the intention to explore catch the big fish.
Remember to have fun
Red hot GT fly fishing action on Providence Atoll’s flats.
The unique fly fishing targets available might have been the major reason you’ve traveled halfway around the world to visit a particular destination but it’s important to remember that you’re going to spend 6 full days in some of the wildest environments on our planet. The sights, experiences, heartbreaks, and successes are better shared with a good friend or like-minded angler. We love the outdoors and that is why we have chosen to spend our time in these settings. We challenge you to have fun, enjoy a drink with your fishing buddy and look around; you are going to experience the rarest of resources – ecosystems fully intact and undisturbed by man.
Where is the best Giant Trevally destination for you?
Several destinations offer anglers the opportunity to cast a fly at a Giant Trevally. As the business that pioneered fly fishing in Seychelles and St Brandon’s Atoll we’ve come to learn which venue is best for your needs and what time of year will most likely provide the experience you are after. If you are looking for the best venues on earth to catch GTs then consider the following:
Providence Atoll, Seychelles
The best saltwater fly fishing destination on earth – Providence Atoll and its mind-blowing diversity will provide you and your fishing partners multiple opportunities in front of hungry Giant Trevally. The atoll, which has received fewer than 1000 visitors in written history is possibly the last true saltwater fly fishing wilderness. For a detailed perspective of what to expect on the flats, read our week-by-week catch reports here, visit our website for more information about Providence Atoll or get in touch with us via email – info@flycastaway.com
Farquhar Atoll, Seychelles
Most famous for its bird-eating GTs – Farquhar Atoll is host to some of the very best fly fishing for Giant Trevally in the world. Its diversity and land-based island lodge make it one of our most popular fly fishing venues. For a detailed perspective of what to expect on the flats, read our week-by-week catch reports here, visit our website for more information about Farquhar or get in touch with us via email – info@flycastaway.com
St Brandon’s Atoll, Mauritius
Better known as home to the best bonefishing in the Indian Ocean – St Brandon still provides opportunities for GTs on the flats. Although its numbers don’t compete with the fisheries of Seychelles, the specimens landed are rarely under the meter mark. If fewer opportunities but the real potential of landing a true giant of the species is more appealing, then consider St Brandon’s Atoll. For a detailed perspective of what to expect on the flats, read our week-by-week catch reports here, visit our website for more information about St Brandon or get in touch with us via email – info@flycastaway.com
We’d love to hear from you
Choosing the fly fishing destination that caters to your preferences isn’t easy. These venues are often in the far-flung corners of the world and require a great deal of time and energy to get to. FlyCastaway has run successful fly fishing trips with the best guide teams in the Seychelles & St Brandon since 2003. Our knowledgeable team works day and night to ensure you have the trip of your dreams. If you’re planning to visit Seychelles or have any other fly fishing travel-related questions, get in touch with us via email – info@flycastaway.com or stay up-to-date with the fishing action on Facebook & Instagram.
Two Bumpies were landed this week, a huge 103cm fish landed by Mark with Chantel getting our second. Two Sailfish were also landed this week, one by Alan and one by Andrew. In addition to the Sailfish caught offshore, George landed a nice Yellowfin Tuna and Genkel landed a nice big Wahoo.
A continuing trend of strong south easterly winds greeted us on the first morning with our new group of guests as the boats headed out. It was an eventful day on the flats with six GTs being landed. Congratulations to David, Peter, Peter, Kay and Mark for opening their accounts. With the cooler water being blown onto the flats there were a good number of Bonefish being hooked and landed, with an average of 6lbs for the session.
Day 2 dawned very windy but with clear skies the boats headed out with high hopes. With a slow neap pushing tide in the early morning the triggerfish were out in numbers. Chuan, Rob and Peter W managed to hook and land one of these feisty fish each. The Bumpies too showed us their massive tails and Mark hooked and landed his first Bumpie, well done Mark. The Bonefish were up and tailing hard again, with Dave and Rod managing to catch a Bonefish each to complete their Flats Slams of a GT, Bone and Trigger. Rod’s Bonefish was a monster, the fish weighing 10 pounds…Congrats! 5 GTs were landed, the day belonging to Dave, who after holding up on the apex of the flat with his guide, saw a monstrous commotion coming towards them in the shallow water. After getting in the perfect position the fly was presented in front of the pack of GTs. In unison the fish charged in the direction of the fly and a gargantuan mouth opened, inhaling the brush fly, the hook was set and after a massive tussle through a lagoon the fish was landed. With a fork length of 127cm, it was truly the GT of a lifetime, well done Dave!
Day 3 saw a shift in the weather conditions with high altitude cloud cover rolling in, obscuring the direct sunlight, making the fishing a little bit trickier. Due to the light conditions the Bumpies highlighted themselves as the targets for the day. A total of 6 Bumpies were landed for the day, the happy anglers being Mark, Kay, Chaun, Alfredo, Rod and Dave H. A great Bumpie day!!!! The GTs did manage to present themselves, Pete and Dave capitalizing on their shots. A special mention goes to Dave H whose fish came in at 105cm. With big seas comes great Sailfish fishing and Rob, Rocky and Dave F taking full advantage, Rocky and Dave landed theirs after doubling up from a pack attack.
Day 4 dawned gloomy with lots of cloud cover and high south easterly winds. After making a shift south to the midway point of the atoll the boats set out. A total of 3 GTs came to hand; well done to Peter getting 2 and Alfredo 1. Rocky managed to double down and land 2 Moustache Triggerfish. Kay and Dave R later joined the Sailfish club, landing a fish each. The day however belonged to Dave H who hooked and landed the first Milkfish for the week as the sun was setting, well done Dave H.
Day 5 saw a lessening of the cloud cover and with a mid-morning low tide the boats set out. The day was a well-rounded one on the species side with 5 of our 7 recognized species being landed. Pete E managed to land the Milkfish, whilst Rob and Dave R landed a Bumpie each. Rocky managed to land a Triggerfish of each species and Dave R managed to land a Moustache Triggerfish. Pete W landed a monstrous Sailfish, whilst Kay, Chuan, Dave R, Mark, Pete W, Pete E and Dave R each landed GTs. The day belonged to Dave R though, who after landing a Bumpy and Triggerfish in successive casts, saw a big bow wave coming up onto the flat. Despite a long chase to get into position, the fish dropped back into the deep water. Dave set up patiently above the area the fish had dropped off from. A couple of minutes later the bow wave reappeared and after presenting the fly it was engulfed on the second strip. The hook was set and the fish tore the line off the reel and ran straight back to the lagoon from where it came. After crossing the lagoon and reaching shallower water the fish was landed. At a fork length of 121cm it was another GT of lifetime for the week. Great fishing Dave!
Our sixth and final day of the week dawned with clear skies and dropping south easterly wind. With a morning dropping tide the Milkfish were up in good numbers around the edge of the atoll. Dave R and Pete W managed to land a fish each, bringing the Milkfish tally to 4 for the week. A total of 6 GTs were also landed. Rob and Dave R landed 2 fish each, with Chuan and Pete E landing a fish each. This brought the second week to a close. Some tough conditions, but as per normal some incredible fish and fishing was enjoyed by all!
This week weather conditions were a little tough. High winds and multiple passing fronts unfortunately made things more challenging them normal. Tides started off on springs, with lots of water movement on and off the flats, and we ended the week in neaps. 
In true Farquhar style, we did however enjoy some other great species fishing. Fifty Bonefish and three Triggers were landed. Craig landed one Moustache and one Yellow Margin, with Jarrett landing a large Moustache. Congrats guys! Three Bumpies were also caught this week, with William, Kris and Jason each landing their first. Well done chaps! And for the second week in a row, Eric landed an Indo Pacific Permit. This week he landed a trophy class fish of 73cm. Amazing fish Eric, well done!
The first day dawned with excitement and a slight south easterly breeze. With an early morning low tide the boats were straight onto the flats and with that the GTs came. Chris, Christiaan, Tom, Shiloh, Nic, Jordan and Jeorg managed to open their GT accounts, with Tom landing a great fish of 96cm and Chris landing a fish of an even 90cm. The Bumpies were up on the flats and Nic, John, Ron and Joerg manged to each land a fish. A special mention goes to Joerg, who, after landing a GT and Bumpy, managed to land an impressive 141cm Barracuda on the flat. With the water high on the flats later in the day we enjoyed a Sailfish session, with Tom and Joerg both landing a fish each before the day came to a close.
The second morning saw another enthusiastic start and the rewards were reaped as Tom, Chris, Shiloh, Jordan and Christiaan all landed GTs. A special mention goes to Christiaan and Jordan who managed to land twin GTs of 118cm each; Christiaan spotting his fish late on into the pushing tide crossing a turtle grass apex, he managed to present the fly in the perfect place and the big fish engulfed the fly on a second attempt. Jordan’s fish was an exceptional tale of the magic of Providence. After teasing up a sailfish offshore he presented his fly to the fish, it was engulfed as it landed but instead of the customary Sailfish jumps, the fish sounded and after a tug of war was brought up to the side of the boat. He rounded off his remarkable day by managing to pick a Moustache Triggerfish out of a school of tailing Bumpies.
The fourth day dawned clear and breezy. With some higher water on the flats in the morning, the boats had access into the unique inner lagoon systems of Providence. It proved to be fruitful as Joerg, Giles, Shiloh, Jordan, Nic, Tom and Joe managed to all land GTs. Tom finally being able to break the one-meter mark with a beautiful fish who was bow waking in super skinny water. Joerg managed to continue his stellar week landing 4 GTs before lunchtime. With access to the lagoons there is the potential for amazing Triggerfish fishing, and this was the case as Christiaan managed to land 3 Yellow Margin Triggers and Mike managing to get his first Moustache Triggerfish as well.
With the tides starting to move towards the neaps, the fifth day brought some more lagoon fishing. A total of 8 GTs came to hand with congratulations going out to Mike, Joe, Christiaan, Jordan and Ron. Christiaan managed to land another Yellow Margin Triggerfish and Shiloh managed his first Triggerfish. This was welcomed with great excitement after many previous disappointments. Joerg tamed another Sailfish in the morning to add to his incredible week.
Day 7 dawned breezy again but with the mothership moored close to the flats the boats spread out for another day of fishing. A total of 8 GTs were landed, a special mention going again to Jeorg who managed a beautiful fish of 106cm. He wasn’t done there though and managed to land his first Yellow Margin Triggerfish, almost completing his list of targeted species. It was a day for the tailing species and after landing two GTs Chris managed to land 2 Bumpies as well, finally catching a Bonefish to round off the slam. Christiaan also managed a slam, landing a GT, a Bonefish and 2 Triggers. John ticked the Yellow Margin Triggerfish off of his list to round off another stellar day out on the atoll.
Dark skies and gloomy weather greeted us on the last morning of the trip. After launching off the mothership a large school of Milkfish were found feeding for the first time this week. The boats quickly got into position and it wasn’t long before Giles managed to hook and quickly land his first Milkfish. After a few near misses, Tom and Christiaan managed to land their first Milks as well. A few pods of GTs were found in the eastern coral gardens and Joe, John and Mike managed to land 4 fish. A special mention goes to Mike whose fish came in at 102cm. With the high cloud cover the water on the flats cooled off and brought with it some epic Bonefishing. A great session was had on the falling afternoon tide. With the fish tailing hard, Shiloh, Nic, Christiaan, Joe, John and Mike capitalized, landing many fish. Christiaan and Shiloh managed to land two great fish both going 10 pounds, a great way to round off the first week of the season.
Another fantastic week of flats fishing has come to an end on Farquhar. We enjoyed great weather, with lower wind speeds and clear skies providing great sight fishing conditions.Tidal wise we start on neaps which built towards a new moon spring tide. This provided a variety of wading opportunities as well as large movements of water in and out of the atoll as the week went on.
Besides the great GT fishing, the rest of the flat’s species were active. Six Triggerfish were landed, including Craig’s personal best 60cm Yellow Margin. Mike landed a massive Moustache Trigger of 56cm. Colin got a 54cm Moustache Trigger which was his first and to top it off Jarret managed a Yellow Margin and a Moustache in the same day!
Thirty-four Bonefish were brought to hand during the week, the largest being a huge 68 x 38cm fish landed by Eric. Also, a big shout to Eric on his first ever Indo Pacific Permit…what a special fish! A personal best Bonefish was also landed by Colin.
