Also known as Amberjack, Cilliated Threadfish, Cobblerfish, Cuban Jack, Diamond Trevally, Fiddler, Gamefish, Hairfish, Indian Threadfin Trevally, Pennantfish, Pennant Trevally, Round-headed Pennentfish, Scad, Shoemaker, Silver Mirrorfish, Sunfish, Thread Pompano, Threadfin, Threadfin Jackfish, Threadfin Mirrorfish, Threadfin Pompano, Threadfin Trevally, Thread-finned Trevally, Threadfish, Trevally.
Found singly, close to the bottom, over shallow parts of oceanic waters.
They feed on crustaceans and fish.
Juveniles diamond shaped, with long trailing filaments, shrinking and then disappearing with age, found close to shores.
Length - 130cm
Depth - 5-100m
This juvenile is thought to mimic venomous jellyfish with it's long filaments.
Jacks are fast swimming fish that can roam over great distances. The larger fish hunt other fish and the smaller fish eat zooplankton. In turn they are hunted by large Tuna and Dolphins. (edit) Ref: https://www.fishbase.se/summary/988