Decapterus macarellus

FamilyScientific NameAuthorYearCommon Name
CarangidaeDecapterus macarellus(Cuvier)1833Mackerel Scad

Decapterus macarellus

Unique Characters: Posterior straight part of lateral line with enlarged hardened scutes. Scales obvious over most or all of body. Adults with pectoral fins relatively short, equal to or shorter than head length. No enlarged scute-like scales in curved lateral line; dorsal accessory lateral line terminating before origin of dorsal fin. Terminal ray of dorsal and anal fins consisting of a detached finlet not connected to penultimate ray by fin membrane. Shoulder girdle margin with a shallow groove, a low moderate papilla above it, and a smaller papilla near upper edge. No row of dark spots along curved lateral line. Posterior end of maxilla straight above, moderately rounded only at lower corner, otherwise posterior margin straight. Straight part of lateral line with 0-33 anterior scales and curved lateral line with 62-79 scales. Straight part of lateral line with 19-33 anterior scales followed by 23-32 scutes. Posterior end of maxilla strongly slanted anteroventrally. Oral valve (membranous flap) at symphysis of upper jaw conspicuously white in adults. Caudal fin yellow-green in life.

Similar Species:

Round Scad
Decapterus punctatus

Redtail Scad
Decapterus tabl

Decapterus punctatus
Round Scad – Decapterus punctatus

Round Scad Decapterus punctatus. Posterior straight part of lateral line with enlarged hardened scutes. No enlarged scute-like scales in curved lateral line; dorsal accessory lateral line terminating before origin of dorsal fin. Scales obvious over most or all of body. Adults with pectoral fins relatively short, equal to or shorter than head length. Terminal ray of dorsal and anal fins consisting of a detached finlet not connected to penultimate ray by fin membrane. Shoulder girdle margin with a shallow groove, a low moderate papilla above it, and a smaller papilla near upper edge. In individuals larger than 10 cm fork length, row of dark spots centered on scales along curved lateral line. Posterior end of maxilla concave above, noticeably rounded and produced below. Straight part of lateral line usually with 0 (rarely 1 or 2) anterior scales and curved lateral line with 37-56 scales.

Redtail Scad Decapterus tabl. Posterior straight part of lateral line with enlarged hardened scutes. Scales obvious over most or all of body. Adults with pectoral fins relatively short, equal to or shorter than head length. No enlarged scute-like scales in curved lateral line; dorsal accessory lateral line terminating before origin of dorsal fin. Terminal ray of dorsal and anal fins consisting of a detached finlet not connected to penultimate ray by fin membrane. Shoulder girdle margin with a shallow groove, a low moderate papilla above it, and a smaller papilla near upper edge. No row of dark spots along curved lateral line. Posterior end of maxilla straight above, moderately rounded only at lower corner, otherwise posterior margin straight. Straight part of lateral line with 0-33 anterior scales and curved lateral line with 62-79 scales. Straight part of lateral line with 0-8 anterior scales followed by 34-44 scutes. Posterior end of maxilla only slightly slanted anteroventrally. Oral valve (membranous flap) at symphysis of upper jaw dusky or hyaline. Caudal fin red in life.

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