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Cosmoledo Week 3 (23-30 November 2016)P1010140

Fly Fishing Giant Trevally

Targeting Giant Trevally on the fly is not for the faint-hearted angler. They are fierce, big, aggressive and incredibly powerful, all of which are quite often completely underestimated by new anglers, but are respected by new and seasoned fishermen alike.

Giant Trevally has also been referred to as being the gangsters of the flats, they have a reputation for being thugs, bullish and unforgiving. They prey on almost anything that moves. From crabs, lobsters, squid, and eels to Mantis Shrimps. However, their favorite prey will be the wide variety of smaller fish that populate the shallow flats. Those will mainly consist of shoaling fish like Mullet, Bonefish, smaller Trevally species like Brassy Trevally and even small shoals of Powter Lips.

You need more than the best Giant Trevally flies, the best rods and conditions to catch a GT – this is no easy feat!


  • Average Length 85cm
  • DIET Carnivore
  • TIME TO GROW 3-4 years
  • AVERAGE AGE 6-7 years
  • AVERAGE CAUGHT 1450 per year
  • TOP SPEED 60 km/h


It is not uncommon to hook a Giant Trevally whilst trawling for Tuna, Wahoo and Sailfish in the deep blue. It has been noted that GTs have been caught in water depths exceeding 80m. On the extreme opposite side of that, as fly fishermen, the most appealing way to hook a GT is in knee-deep water wading the flats. This just proves that they are an apex predator which hunts in the deep waters around the Islands’ to the lagoons’ and shallow flats’ of all the Atolls’.



A similar approach to Giant Trevally fly choice can be taken with big barracuda. The fly choice should be dictated by the area you are fishing and the bait species that inhabit that locality. Brush flies, sempers and poppers are all effective. As a general rule lighter colored flies should be used on the white sand e.g. tan and white, these lighter colors are more representative of species such as mullet, small trevally and bream. Darker colored patterns are more suitable for surf areas and coral fingers e.g. red, black, brown, making a realistic impression of various types of reef dwellers, grouper, snapper and emperors.

Here are 3 flies that will always be in our guides box.

  • Black Brush Fly

    This fly has probably taken down more GTs than any other fly that we use. The combination of adding a hint of purple, red or olive to the black brush fly also works really well. Often I get asked by guests “what fly works the best?” my reply is standard, “you can use any fly you want as long as it is a black brush fly!”

    available On Island
  • Olive and Red Semper

    This fly, like all Semper patterns, have an incredible movement in the water which makes them irresistible to any cruising Giant Trevally. Both of the above mentioned flies are fished in the same way. Long and fast as possible strips/retrieves need to take place.

    available On Island
  • Popper

    Traditional popper patterns are becoming very popular as they create a greater disturbance on the water. Poppers are generally fished over deeper waters such as drifting on the skiff in the lagoons, casting into the channels as well as floating the outer shallow reef of the atolls.

    available On Island
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Fly fishing is an art form that not everyone can master. It takes skill, patience, determination and knowledge. The right rod will take you a lot closer to landing the catch. 12 Weight fly rods are used to target Giant Trevally. Together with a high-quality large arbour saltwater series reel, with a strong smooth drag to match the 12-weight fly rod. The reel should be loaded with three hundred yards of 80lbs braid. The rod should have the ability to hold and pull fish, therefore any rod with a strong butt section is recommended.
GT - Tides


A pushing tide is considered to be the best time to target Giant Trevally. This is because the fish know that they have plenty of water pushing behind them on the flats and are more at ease as to not get trapped, as opposed to a dropping tide. As the cool fresh water flows onto the shallow flats many invertebrates such as crab, shrimp and worms leave their holes. In turn, brings Bonefish and other small fish onto the flats to feed and the chain continues up to the bigger predatory fish like the Giant Trevally.


Upon seeing a Giant Trevally, it is crucial to remain calm. Listen to your guide. Move into position quickly whilst trying not to make too much noise and keeping your fly line clear of any potential snags. Under the guide's instruction make the cast. Leading the fish by 3 - 4 rod lengths is the general rule. If the fly lands on the head or behind the GT, the chances of the fish eating are almost none. Once the fly has been presented and all is still well, a long and fast retrieve is necessary. The fish eats the fly. Keeping the rod tip pointing down, set the hook by strip/line setting. Lifting the rod in an attempt to set hook will not be effective and is a sure way to get the hairs on the back of your guide’s neck stand on end. Only once the Giant Trevally is on the reel can you lift the rod and fight. Get ready for one hell of a fight!

Giant Trevally Gallery

Some of the big GTs that did not get away.
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"This was my dream catch, she was huge and put up a heck of a fight." - Craig Williams

Read more about the Giant Trevally below straight from our experts READ MORE


We choose destinations that meet our anglers’ needs and desires. You can focus on one atoll or combine several for a richer and more varied experience.
  • Alphonse Atoll


    Alphonse Atoll

    A dream destination for any fly fisherman, Alphonse Atoll in Seychelles is renowned for its expansive sea flats, which provide easy wading and world class fishing.  The atolls are regarded as some of the most pristine, untouched islands in the world yet Alphonse Atoll is just a 60-minute flight from Mahé.

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  • Cosmoledo Atoll


    Cosmoledo Atoll

    Cosmoledo Atoll is just a stone’s throw away from the world heritage site of Aldabra, often referred to as the Galapagos of the Indian Ocean. Its ecosystem is pristine with saltwater flats and a huge variety of fish species, attracting fly fishermen from around the world. It is home to a newly built eco-camp, dedicated to the atoll’s conservation.

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  • Astove Atoll


    Astove Atoll

    The home of the biggest giant trevallies in the Indian Ocean, this island in the Seychelles offers superb fly fishing in a shallow lagoon surrounded by sheer drop-offs. Just over a thousand kilometres from Mahe, this atoll forms part of the remote Aldabra group of atolls. Uninhabited since 1969, this atoll has seen very little human presence which makes for a wild and unique experience.

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  • Poivre Island


    Poivre Island

    Poivre Atoll offers the best of both worlds with stunning flats and arguably one of the best jigging and popping spots that the Amirantes Atolls have to offer. Known for record breaking Dogtooth Tuna and some of the best Indo-Pacific Permit fishing in the Seychelles, Poivre offers the ultimate challenge for any game fisherman worth his salt.

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Turn your fly into a fish’s ultimate temptation. Seychelles, with its 115 islands and deserted atolls, ideal weather and warm Indian Ocean waters, is renowned for being home to some of the world’s richest fishing grounds. You don’t even have to venture too far to break fishing records!

Unique experiences like nowhere else


  • Home of the worlds best fly fishing
  • Unique, bespoke trips to suite your needs
  • Located in the pristine remote outer islands of the Seychelles
  • Luxury accommodation and exquisite food
  • Unrivaled professional guides
  • Some of the richest fishing grounds in the world
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Let us craft unbelievable fly fishing experiences for you ENQUIRE NOW