SCOMBRIDAE Grammatorcynos bilineatus, 24.6 cm SL (photo by Ukkrit Satapoomin) Grammatorcynos bilineatus (Rüppell, 1836) Doublelined Mackerel D XI-XIII + 10-14; A 10-14; P1 22-26; GR 17-24. Body elongate, somewhat compressed. Jaws with slender, conical teeth; sharp teeth on tongue forming a rectangular patch. Caudal peduncle with a large lateral keel and caudal-fin base with 2 small keels. Two dorsal fins separated by only a narrow interspace. Six or seven finlets on caudal peduncle both dorsally and ventrally. Pectoral fins short; a small single flap between pelvic fins (interpelvic process). Body covered with small scales. Two lateral lines. Color: head and body silvery-white with dark bluish green dorsum. No black spots on belly. Size: maximum length 100 cm FL. Distribution: widely distributed in tropical and subtropical Indo-West Pacific, from Red Sea to Fiji, north to southern Japan. Remarks: found in coastal waters. Marketed fresh.