Diamond Trevally, Indian Threadfin Trevally (Alectis indicus)
Local name: Ebek
Biology & fishery
Often confused with the Treadfin Trevally (Alectis Ciliaris), juvenile Diamond Trevally have very elongate trailing filamentous fins from the dorsal and anal fins. These fins become shorter and finally disappearing at adult stage.
An interesting observation is that it is thought the purpose of the filamentous fins in juveniles allows the fish to mimic jelly fish which is thought to discourage predators.
Found in large schools together with Decapterus Maruadsi (Japanese Scad) or Sardine, Selar, Cencaru, in the morning or at night perhaps also feeding off them. Inhabits coastal waters around 20 m, usually feeding on small fish, squids and crustaceans.
Common size 18 – 25 cm and can reach 30 cm. Maximum size reported is 150 cm (20+ kg).
Common in the east coast of Malaysia where it is caught in good numbers during the post-monsoon period (February – May).
Juveniles are attractive aquarium fish, but do not do well in captivity. Used for making fish crackers and also consumed fresh or salt dried. Adult fish flesh are tough. I tried eating a 3kg fish once and it felt like eating wet plywood!