Doublelined mackerel (Grammatorcynus bilineatus) is a saltwater species recorded in Malaysia. It is mainly found over reef, at depths of 15–50 m.
Scientific name: Grammatorcynus bilineatus · Water: Saltwater
Size: up to 100 cm
The doublelined mackerel is a scombrid that inhabits open water but is often seen swimming near outer reef walls or down deep clear-water slopes, and is found mostly in shallow reef water where it forms large schools. It feeds on crustaceans and fishes, particularly clupeoids such as Sardinella and Thrissocles, and also on barracudas and triggerfishes. Its flesh is mild and pleasantly flavoured, and it is marketed canned and frozen. Its range covers the Indian Ocean from the Red Sea east to the Andaman Sea and the western Pacific from the Ryukyu Islands to the northern coasts of Australia, including the Marshall Islands and Fiji; the literature often confuses it with Grammatorcynus bicarinatus. It lives from 15 to 50 m and reaches about 100 cm fork length, commonly 50 cm total length, and up to about 3.5 kg. It is a minor commercial species and a game fish, selling in the highest price band, with a trophic level of 4.2, moderate to high fishing vulnerability at 48 of 100, very high climate vulnerability at 89, and medium resilience.
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