Giant trevally habitat
This species is pelagic and occur to depths exceeding 100 m (Wetherbee et al. 2004). This species occurs in many habitats, including rock, coral reef channels, inner reefs, and seaward reefs (Lieske and Myers 1994, Mundy 2005). This species is also found over sand flats inshore. This species is a facultative schooling species (Major 1978) with adults solitary or in schools. Juveniles occur in small schools over sandy inshore bottoms (Myers 1999) and occasionally in turbid estuaries (Blaber and Cyrus 1983). Wide tolerance of salinity has been observed in juveniles and subadults (Blaber and Cyrus 1983). However, the presence of estuarine habitat isn't necessary for this species to thrive, as observed by Sudekum et al. (1991) in the NW islands of Hawaii where this species occurs in high abundance, but estuarine habitat is absent. This species feeds during the day, mostly on demersal and pelagic fishes. This species also consumes cephalopods and crustaceans (Blaber and Cyprus 1983, Sudekum et al. 1991).
This species is one of the largest of the carangid fishes, measuring up to 170 cm total length (Lieske and Myers 1994). The world angling record (IGFA) is 66 kg (Smith-Vaniz 1984), and the largest published weight for this species is 86.6 kg (Murakami et al. 2007). This species can live to at least 20 years of age and has been recorded to 30 years of age in captivity (Friedlander and Dalzell 2004). Sudekum et al. (1991) determined females of this species reach maturity at approximately 60 cm (SL) and 3-4 years of age. However, Tharwat and Al-Gaber (2006) observed maturity to occur around is 37 cm in length (sex unknown). This species forms spawning aggregations which have been observed on shallow seaward reefs and offshore banks (Sudekum et al. 1991, de Silva et al. 2014). Spawning takes place during the summer months (peak May-August) in Hawaii (Friedlander and Dalzell 2004, Meyer et al. 2007). In Kaneohe Bay, Hawaii, juveniles less than 20 cm, occurred on the murky lagoon floor (Wetherbee et al. 2004). When juveniles reached 25 to 40 cm in length, they moved to the lagoonal patch reefs. Once larger than 40 cm, juveniles and subadults moved outside of the bay.