Blue trevally (Ferdauia ferdau) is a saltwater, brackish species recorded in Taiwan, Singapore, Malaysia. It is mainly found over reef, at depths of 0–60 m.
Scientific name: Ferdauia ferdau · Water: Saltwater, Brackish
Size: up to 70 cm
The blue trevally is a carangid found in coastal waters next to sandy beaches, also down to about 60 m and often near reefs; it is pelagic and occurs singly or in small groups. It feeds mainly on molluscs and bottom-dwelling crustaceans, and occasionally on the small fish that are abundant in lagoons. Its range is tropical, between roughly 37 degrees north and 35 degrees south, from the surface to about 60 m. It reaches about 70 cm total length, commonly 30 cm, and up to about 8 kg. It supports commercial fisheries and is a game fish, selling in the medium price band, with a trophic level of 4.3, moderate fishing vulnerability at 44 of 100, and medium resilience.
Caution: large individuals carry a ciguatera risk. Heat, cold and marinating do not remove the toxin, which concentrates in the liver, roe and head, so avoid eating those parts. Seek medical help if numbness, tingling or a reversed sense of hot and cold follows a meal.
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