How to Identify Dusky Kob

To identify Dusky Kob (Argyrosomus japonicus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery-grey to bronze dorsally, fading to white or pale silver ventrally. Fins are typically dusky or yellowish. Juveniles may have faint vertical bars.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent lateral line that is often silvery or iridescent, curving upwards over the pectoral fin., Large, terminal mouth with small, sharp teeth., A series of small pores along the lower jaw., Often exhibits a coppery or bronze sheen, especially on the back and upper flanks.

Dorsal fin

Two dorsal fins; the first is short with 8-10 strong spines, the second is much longer with 1 spine and 24-27 soft rays. A deep notch separates the two.

Tail fin

Large, slightly emarginate to truncate caudal fin.

Pectoral fin

Moderately long pectoral fins, typically reaching to or beyond the origin of the second dorsal fin.

Distinctive fins

Anal fin with 2 spines and 7-8 soft rays. Pelvic fins thoracic, with 1 spine and 5 soft rays.

Identification Tips

1. 1

   Lateral Line

   The most distinguishing feature is its prominent, often silvery, lateral line that curves noticeably upwards above the pectoral fin.

2. 2

   Mouth and Teeth

   Possesses a large, terminal mouth with small, sharp, conical teeth arranged in bands, and often a pair of larger canines at the front of the upper jaw.

3. 3

   Dorsal Fins

   Two distinct dorsal fins, with the first being spiny and much shorter than the long, soft-rayed second dorsal fin, separated by a deep notch.

4. 4

   Coloration

   Generally silvery-grey to bronze, often with a coppery sheen, especially on the back. Juveniles may have faint vertical bars.

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