Auxis thazard

Auxis thazard
Frigate Mackerel – Auxis thazard
FamilyScientific NameAuthorYearCommon Name
ScombridaeAuxis thazard(Lacep├Ęde)1800Frigate Mackerel

Auxis thazard

Unique Characters: Two small keels and a large median keel between them on either side of caudal peduncle. 7-10 dorsal and 7-10 anal finlets. Adipose eyelids absent. Teeth in jaws slender, conical, hardly compressed Corselet of scales well developed. Upper surface of tongue with 2 longitudinal ridges. 9-16 spines in first dorsal fin. First and second dorsal fins widely separated, the space between them equal to the length of first dorsal-fin base. 9-11 spines in first dorsal fin. Interpelvic process single and long, at least as long as longest pelvic fin ray. Posterior extension of corselet narrow, only 1 to 5 scales wide under origin of second dorsal fin. Pectoral fin extends posteriorly beyond a vertical with the anterior margin of the dorsal scaleless area.

Similar Species: Bullet Mackerel Auxis rochei. Two small keels and a large median keel between them on either side of caudal peduncle. 7-10 dorsal and 7-10 anal finlets. Adipose eyelids absent. Teeth in jaws slender, conical, hardly compressed. Corselet of scales well developed. Upper surface of tongue with 2 longitudinal ridges. 9-16 spines in first dorsal fin. First and second dorsal fins widely separated, the space between them equal to the length of first dorsal-fin base. 9-11 spines in first dorsal fin. Interpelvic process single and long, at least as long as longest pelvic fin ray. Posterior extension of corselet much wider, usually 10-15 scales wide under origin of second dorsal fin. Pectoral fin does not extend posteriorly as far as a vertical with anterior margin of dorsal scaleless area.

Auxis rochei
Bullet Mackerel – Auxis rochei
Auxis Lateral Line Comparison
Auxis Lateral Line Comparison

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