How to Identify Atlantic horse mackerel

To identify Atlantic horse mackerel (Trachurus trachurus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal side is typically bluish-green to grey, fading to silvery-white on the flanks and belly. A distinct black spot is often present on the upper margin of the operculum.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Two dorsal fins, the first spiny and the second soft-rayed., A series of prominent, keeled scutes (bony plates) along the entire lateral line, which are larger and more pronounced posteriorly., A small, detached finlet often present behind the second dorsal and anal fins (though less pronounced than in true mackerels)., Large eyes.

Dorsal fin

Two dorsal fins: the first with 8-9 spines, the second with 1 spine and 28-33 soft rays. A small finlet may follow the second dorsal.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Long and falcate (sickle-shaped), extending beyond the origin of the second dorsal fin.

Distinctive fins

Anal fin with 2 detached spines followed by 1 spine and 24-29 soft rays. A small finlet may follow the anal fin.

Identification Tips

1. 1

   Lateral Line Scutes

   The most definitive feature is the complete lateral line armed with large, bony scutes, particularly prominent towards the tail. This distinguishes it from true mackerels (Scomber spp.) which lack these scutes.

2. 2

   Opercular Spot

   Presence of a distinct black spot on the upper part of the operculum (gill cover).

3. 3

   Dorsal Fins

   Two distinct dorsal fins, the first spiny and the second soft-rayed, followed by a small finlet (though sometimes indistinct).

4. 4

   Body Shape

   Elongated, fusiform body, somewhat compressed laterally.

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