How to Identify Sierra Mackerel

To identify Sierra Mackerel (Scomberomorus sierra), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal surface iridescent blue-green, fading to silvery on the flanks and belly. Distinctive pattern of numerous small, round, golden-bronze spots arranged in several irregular rows along the sides, particularly above the lateral line. The first dorsal fin is dark, often blackish anteriorly.

Scale type

none

Mouth position

terminal

Distinctive features

Streamlined, fusiform body, Laterally compressed, Numerous small, round, golden-bronze spots on sides, Absence of scales on the body except for the corselet (a patch of larger, modified scales behind the head and around the pectoral fins), Two dorsal fins, followed by 8-10 finlets, Anal fin followed by 7-9 finlets, Large, deeply forked caudal fin

Dorsal fin

Two dorsal fins; the first is long with 15-18 spines, the second is shorter with 15-18 soft rays, followed by 8-10 dorsal finlets.

Tail fin

Deeply forked and lunate (crescent-shaped), characteristic of fast-swimming pelagic fish.

Pectoral fin

Short and set high on the body, with 20-24 rays.

Distinctive fins

Pelvic fins are small and located beneath the pectoral fins. Anal fin has 15-18 soft rays, followed by 7-9 anal finlets. The finlets are a key scombrid characteristic, aiding in reducing turbulence during high-speed swimming.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for the torpedo-shaped body, iridescent blue-green back, silvery sides, and the distinctive pattern of numerous small, round, golden-bronze spots along the flanks. The first dorsal fin is often dark.

2. 2

   Finlets

   The presence of 8-10 dorsal finlets and 7-9 anal finlets behind the main dorsal and anal fins is a definitive characteristic of Scombridae, including the Sierra Mackerel.

3. 3

   Lateral Line

   The lateral line is prominent and typically curves abruptly downwards below the second dorsal fin, then continues straight to the caudal fin base.

4. 4

   Absence of Scales

   Most of the body lacks visible scales, except for a small corselet of modified scales behind the head and around the pectoral fins.

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