The species has also successfully been bred for aquaculture purposes in Taiwan. The species is commonly taken on bibbed plugs, minnows, spoons, jigs and poppers, soft plastic lures and saltwater flies. Culturally, the fish was seen as a god , and treated as gamefish which commoners could not hunt. Each individual appears to spawn more than once in each period, with only part of the gonads ripe in spawners. It is a semipelagic fish known to spend time throughout the water column, but is mostly demersal in nature. Larvae have no association with reefs, and appear to prefer to live pelagically. The authors argued, based on this test, the flesh of giant trevally was safe to consume. Observations from South African estuaries indicate the schools of smaller juveniles tend not to intermingle with schools of other species, but larger subadults are known to form mixed-species schools with the brassy trevally.
The fish are efficient predators of these crustaceans, with individuals often seizing a lobster before it could sink to the seafloor after being released, or attacking before the lobster moves into a defensive position. In contrast, it comprises less than 0. The species' edibility has been rated from poor to excellent by different authors, although numerous cases of ciguatera poisoning have been reported from the species. Larvae appear to also opportunistically feed on small zooplankton while swimming. Some recreational fishing groups are also promoting a catch and release practice for the giant trevally, with this becoming an increasingly popular option for charter boat operators, who have also begun to tag giant trevally for scientific purposes. The anal fin consists of two anteriorly detached spines followed by one spine and 15 to 17 soft rays. Culturally, the fish was seen as a god , and treated as gamefish which commoners could not hunt. The maximum theoretical length of the species predicted by the growth curves is 1. The specimen was initially thought to be a bluefin trevally of world-record size, but was later rejected when it was discovered to be a hybrid. This number is considerably less in heavily fished Hawaiian waters. Each individual appears to spawn more than once in each period, with only part of the gonads ripe in spawners. The seal does not appear to gain any benefit from this relationship, and it is thought juvenile seals being followed in this way may be outcompeted by the larger fish. The fish then diverged and swam away. Its distribution continues throughout the western Pacific, including Tonga , Western Samoa and Polynesia , with its westernmost limits known to be the Pitcairn and Hawaiian Islands. Some bolder, large individuals are even known to eat the lobster head first when its in a defensive stance. The only time hunting in schools is a disadvantage is when only isolated prey are present, such as close to a reef; here, an individual hunter has a greater probability of capturing it than if a group is present. This later revision in classification saw the species moved to the genus Caranx, where it has remained. Despite this, intrusions of giant trevally into modern-day fishponds used by Hawaiians for rearing fish are unwelcome; being a predator, it eats more than it is worth at market. The two species are known to school together, including at spawning time, which was considered to be the reason for hybridisation. Its range extends eastwards along the Asian coastline, including Pakistan , India and into Southeast Asia , the Indonesian Archipelago and northern Australia. This is believed to allow the fish to gain a panoramic view of its surroundings, removing the need to constantly move the eye, which in turn will allow easier of detection of prey or predators in that field of view. 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. Larvae have no association with reefs, and appear to prefer to live pelagically. All the fins are generally light grey to black, although fish taken from turbid waters often have yellowish fins, with the anal fin being the brightest. This was due to the highly size-selective nature of the fishery, which theoretically should prevent a decrease in numbers.
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