Common name/s: Silver trevally: Scientific name: Pseudocaranx spp. It is similar to most other trevallies and jacks in having a compressed, oblong body, with the dorsal profile slightly more convex than the ventral profile, particularly anteriorly. The species' aquaculture potential was first investigated in a 1975 experiment in French Polynesia, where juveniles of the species were caught in the wild and transported back to a laboratory. [9] Some juvenile fish have also been recorded as having up to five dark vertical bars on their sides. Trevally can be identified by the distinctive black dot at the top of their gill plates. [17] There is also a difference in the length at maturation between the two sexes, with females on average reaching maturity at 32.5 cm length, while males attain maturity at 35 cm on average. These dark fish in ambush mode vigorously drive away any other bluefin trevally that stray too close to the aggregation. The species is known to move throughout the water column; however is most often observed in a demersal setting, swimming not far from the seabed. Both were initially identified as hybrids by intermediate physical characteristics, and were later confirmed by DNA sequencing. [14] Elsewhere in the Indian Ocean, the species has been recorded from hundreds of small island groups including the Maldives, Seychelles, Madagascar and the Cocos (Keeling) Islands. [18][19][20] A black spot is also found on the gill cover. Description. Juveniles consume a higher amount of small crustaceans, but transfer to a more fish based diet as they grow. [25] In groups, these fish will rush their prey, and disperse the school, allowing for isolated individuals to be picked out and eaten,[25] much in the way the related species, giant trevally have been observed to do in captivity. [17] In the inshore environment, the species is present in almost all settings including bays, harbours, coral and rocky reefs, lagoons, sand flats and seagrass meadows. [19][24] In Hawaii, crustaceans make up 96% of the gut contents numerically, with tanaids and isopods dominating the diet, while fish only make up 4% numerically. The species is reported to hunt during the day, particularly at dawn and dusk in most locations;[31] however it is known to be a nocturnal feeder in South Africa. [33] Small fish are able to effectively filter these small crustaceans from the water, while adults are not. [16], The bluefin trevally occurs in a wide range of inshore and offshore marine settings throughout its range, including estuarine waters. Trevally has Legal-size trevally is 20 cm, with a daily bag limit of 20 legal sizes per person. [19] The diet overlap with the similar C. ignobilis is low in the Hawaiian Islands, suggesting there is some separation of feeding niches. Even the smallest of them, the 7-8 kilo giant trevally, will try to rip your arms off. The species has many other non-English names due to its wide distribution. Possession limits on takes. (2019). Fish Species - Legal Size length and Bag Limits. [8] It is similar in shape to a number of other large jacks and trevallies, having an oblong, compressed body with the dorsal profile slightly more convex than the ventral profile, particularly anteriorly. It is a multiple spawner, capable of reproducing up to 8 times per year, releasing up to 6 million eggs per year in captivity. Sometimes a yellowish colour … Minimum legal length: 24 cm. [32] Once the prey is close enough to the hiding spot, the fish ram the base of the school, before chasing down individual fish. [25] In many cases, the species uses changes in the depth of the reef such as ledges to conceal its ambush attacks. Fish include tuna, shark, trevallay, snapper, marlin, mackerel and flathead etc. Fish with a maximum size limit must be landed whole (see page 39). In the boxing match that is fishing for these fish, if the rod is the jab, the reel is the uppercut—the opponent won’t be bested without a good one. [48] The species readily accepts both bait and lures, with live fish or squid often used as bait and a variety of lures also used on the species. * Bag limit comprised of any single species or a combination of listed grouped species. They put up a much stronger fight than their size would predict. The anal fin consists of 2 anteriorly detached spines followed by 1 spine and 17 to 20 soft rays. [8][11] In the south, the species reaches as far south as Sydney in Australia. [12][15] The easternmost limit of the species distribution is the Mesoamerican coastline between Mexico and Ecuador in the central eastern Pacific,[8] including islands such as the Galápagos Islands. [22] Apart from the typical predator-prey relationship the species shows (described later), an individual of the species has been seen to rub itself against the skin of a Galapagos shark, apparently to rid itself of parasites. JCs can grow up to 4ft and 60lbs. [21] Adults tend to prefer more exposed, deeper settings such as outer reef slopes, outlying atolls and bomboras, often near drop offs,[16] with the species reported from depths up to 183 m.[21] Adults often enter shallower channels, reefs and lagoons to feed at certain periods during the day. Also sometimes known as the lowly trevally (or Ulua in Hawaii), the giant trevally is the largest member of the trevally family (Carangidae). [23] Individuals of between 40 and 170 mm have been recorded in South African estuaries, where they are the least tolerant carangid to the brackish and freshwater conditions of these systems. The species has 25 to 29 gill rakers in total and there are 24 vertebrae present. 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