The species of fish is an apex predator in the most of habitats. See the creative common license terms by clicking "CC" icon below the map. The fish is found in the water of the Indo-Pacific region. It is the powerful carnivorous fish and even eats dead fish. Size is also a better predictor of endurance in larvae than age. The fish then diverged and swam away. The fish grows relatively fast, reaching sexual maturity at a length of around 60 cm at three years of age. GT’s are wide ranging and can be found cruising in shallower nearshore as well as offshore reef structures such … A female chased by the four darker male that would be suitors until a pair sink to the sandy bottom where sperm and eggs are released. Younger fish apparently actively seek out these turbid waters, and when no estuaries are present, they live in the turbid inshore waters of bays and beaches. In all but one study (which was of juveniles), the giant trevally dominantly takes other fishes, with various crustaceans, cephalopods and occasionally molluscs making the remainder of the diet. Interesting facts about Trevally. The eye of the giant trevally has a horizontal streak in which ganglion and photoreceptor cell densities are markedly greater than the rest of the eye. Sampling of schools prior to spawning suggests the fish segregate into schools of only one sex, although the details are still unclear. Black dots of a few millimetres in diameter may also be found scattered all over the body, although the coverage of these dots varies between widespread to none at all. However, analysis of case studies in which ciguatera poisoning was reported after eating the fish suggested an accumulative effect occurs with repeated consumption; and tests like the one outlined above are not reliable, as the toxin appears to be distributed haphazardly throughout each fish. 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. The latter of these names once again highlighted the similarity with the crevalle jack, with the epithet hippoides essentially meaning "like Carangus hippos", which was the crevalle jack's Latin name at that time. Juveniles of the species are known to live in waters of very low salinity such as coastal lakes and upper reaches of rivers, and tend to prefer turbid waters. The species has some quite novel hunting strategies, including shadowing monk seals to pick off escaping prey, as well as using sharks to ambush prey. The eye is covered by a moderately well-developed adipose eyelid, and the posterior extremity of the jaw is vertically under or just past the posterior margin of the pupil. These observations suggest the species becomes an effective swimmer (is able to swim against a current) around 7–14 mm. Observations in the natural habitat found spawning occurred during the day immediately after and just before the change of tide when there were no currents. Creative Commons Attribution-ShareAlike 4.0 International, © Thai National Parks, 2020 | T.A.T. The fish has the lifespan of 20-25 years in the wild. After Forsskål's initial description and naming, the species was independently renamed three times as Caranx lessonii, Caranx ekala and Carangus hippoides, all of which are now considered invalid junior synonyms. Sex ratio estimates from the Hawaiian Islands suggest the population is slightly skewed toward females, with the male:female ratio being 1:1.39. In some of these locations, such as Australia, it is a common and relatively abundant inhabitant, while in others, including South Africa and Hawaii, it is much rarer in estuaries. They are usually eaten fresh but can also be frozen up to 3 months. The species has 20 to 24 gill rakers in total and 24 vertebrae are present. The giant trevally inhabits a wide range of marine environments, from estuaries, shallow bays and lagoons as a juvenile to deeper reefs, offshore atolls and large embayments as an adult. The giant trevally is a powerful apex predator in most of its habitats, and is known to hunt individually and in schools. The giant trevally reaches sexual maturity at 54 to 61 cm in length and three to four years of age, although many authors narrow this down to 60 cm and three years of age. The average catch is in the 6–8 lb range, but monsters double or even triple that size show up from time to time. This was due to the highly size-selective nature of the fishery, which theoretically should prevent a decrease in numbers. Targeting giant trevally on the fly is not for the faint-hearted angler. "The giant trevally, as befits its name, can reach six feet in length and 180 pounds! It is the largest fish in the genus Caranx, growing to a maximum known size of 170 cm and a weight of 80 kg. The curved section of the lateral line contains 58-64 scales, while the straight section contains none to four scales and 26 to 38 very strong scutes. Its range extends eastwards along the Asian coastline, including Pakistan, India and into Southeast Asia, the Indonesian Archipelago and northern Australia.

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