Jul 17 2008

What is GT? What is Ulua?

Published by admin at 8:50 am under Fish Species

GT stands for Giant trevally or Caranx Ignobilis, Ulua is the Hawaiian popular name for GT. As the description for GT in the fishbase.org as below.

Importance:

Family: Carangidae (Jacks and pompanos) picture (Caign_u4.jpg) by Randall, J.E.
Image for Caranx ignobilis, Carangidae, Giant trevally.

AquaMaps |
Order: Perciformes (perch-likes)
Class: Actinopterygii (ray-finned fishes)
FishBase name: Giant trevally
Max. size: 170 cm TL (male/unsexed; Ref. 9710); max. published weight: 80.0 kg (Ref. 4795)
Environment: reef-associated; brackish; marine; depth range 10 – 188 m
Climate: fisheries: commercial; aquaculture: commercial; gamefish: yes; aquarium: public aquariums; price category: high; price reliability: reliable: based on ex-vessel price for this species
Resilience: Medium, minimum population doubling time 1.4 - 4.4 years (K=0.08-0.11; tm=3.5)
Vulnerability: High to very high vulnerability (68.81), based on Lmax and K (Ref. 59153)
Distribution:
Gazetteer		 Indo-Pacific: Red Sea and east coast of Africa to the Hawaiian and Marquesan islands, north to southern Japan (Ref. 559) and the Ogasawara Islands, south to northern Australia. Hybrid with Caranx melampygus found in Hawaii (Ref. 58422).
Morphology: Dorsal spines (total): 9 - 9; Dorsal soft rays (total): 17 - 22; Anal spines: 3; Anal soft rays: 15 – 17. Head and body dusky golden dorsally, silver ventrally; fins usually pigmented grey to black. Opercular spot absent. 26-38 strong scutes. Breast without scales ventrally; a small patch of prepelvic scales. Pectoral fins falcate; anal fin with 2 detached spines.
Biology: Pelagic over sand and rock (Ref. 58302). Adults occur singly and inhabit clear lagoon and seaward reefs (Ref. 9710). Juveniles found in estuaries. Feed on crustaceans (like crabs and spiny lobsters) and fishes at night (Ref. 4887). Large individuals may be ciguatoxic. The largest trevally, reaching 1.7 m in length and a weight of over 60 kg (Ref. 48635). Spawn on shallow seaward reefs and offshore banks (Ref. 37816). Sold mostly fresh and dried salted.

Red List Status: Not Evaluated (Ref. 57073)
Dangerous: reports of ciguatera poisoning

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