How to Identify Indian Mackerel

To identify Indian Mackerel (Rastrelliger kanagurta), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal surface metallic blue-green, fading to silvery white on the flanks and belly. Typically features 2-6 narrow, dark longitudinal stripes on the upper body, which may be broken or indistinct. A black spot is often present on the body near the lower margin of the pectoral fin.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Fusiform, moderately compressed body., Two widely separated dorsal fins, followed by 5-6 dorsal finlets., Single anal fin followed by 5-6 anal finlets., A prominent black spot near the pectoral fin base., Gill rakers are very long and visible when the mouth is open, extending beyond the gill arch., A small, pointed snout.

Dorsal fin

Two dorsal fins; the first with 9-11 spines, the second with 12 soft rays, followed by 5-6 finlets.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Short, located high on the body.

Distinctive fins

5-6 dorsal and 5-6 anal finlets are characteristic of the Scombridae family.

Identification Tips

1. 1

   Gill Rakers

   The most reliable distinguishing feature from similar species: the gill rakers are very long, extending to or beyond the angle of the gill arch, and are visible when the mouth is open.

2. 2

   Longitudinal Stripes

   Presence of 2-6 narrow, dark longitudinal stripes on the upper body, which can be broken or indistinct.

3. 3

   Black Spot

   A distinct black spot often present on the body near the lower margin of the pectoral fin.

4. 4

   Body Depth

   Body depth is typically 4.3-5.2 times in standard length, making it relatively slender compared to some other mackerel species.

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