How to Identify Atlantic Mackerel

To identify Atlantic Mackerel (Scomber scombrus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal side is iridescent blue-green with 23-33 dark, wavy, vertical bars or stripes extending down to the lateral line. Sides are silvery-white, and the belly is silvery. The coloration fades rapidly after death.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Streamlined, fusiform body, Absence of a swim bladder, Two widely separated dorsal fins, Five to six finlets behind the second dorsal and anal fins, Small, smooth scales (cycloid) that are barely visible, Large eyes, Pointed snout

Dorsal fin

Two distinct dorsal fins. The first dorsal fin has 10-13 spines. The second dorsal fin has 10-15 soft rays, followed by 5-6 dorsal finlets.

Tail fin

Deeply forked (lunate) caudal fin, characteristic of fast-swimming pelagic fish.

Pectoral fin

Short, triangular pectoral fins positioned relatively high on the body.

Distinctive fins

Five to six small, detached finlets are present behind both the second dorsal fin and the anal fin, a key characteristic of Scombridae.

Identification Tips

1. 1

   Body Shape

   Look for the classic torpedo-shaped, streamlined body, indicative of a fast swimmer.

2. 2

   Coloration and Markings

   Identify the iridescent blue-green back with distinct, dark, wavy vertical bars that do not extend below the lateral line. The belly is silvery-white.

3. 3

   Finlets

   Count the 5-6 small finlets behind both the second dorsal and anal fins. This is a definitive characteristic of mackerel species.

4. 4

   Absence of Swim Bladder

   While not visible externally, the lack of a swim bladder contributes to their constant swimming behavior to maintain buoyancy, a behavioral clue.

5. 5

   Scales

   Note the very small, smooth scales that are barely noticeable, giving the fish a sleek feel.

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