How to Identify Spot

To identify Spot (Leiostomus xanthurus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery body with a greenish-gray to bluish-gray back, fading to a silvery-white belly. Approximately 12-15 faint, oblique dark bars may be present on the upper sides, often fading after capture. The most distinguishing feature is a prominent, dark, circular spot located just behind the upper margin of the operculum (gill cover). The pectoral, pelvic, and anal fins are typically yellowish, giving rise to the alternative name 'yellowfin croaker'.

Scale type

ctenoid

Mouth position

subterminal

Distinctive features

Prominent dark spot behind the operculum., Compressed, oval-shaped body., Slightly inferior mouth., Small, barbels on the chin (often inconspicuous).

Dorsal fin

Two dorsal fins; the first is spiny with 10-11 spines, and the second is soft-rayed with 1 spine and 29-35 soft rays. A deep notch separates the two fins.

Tail fin

Slightly emarginate to truncate caudal fin.

Pectoral fin

Relatively long and pointed pectoral fins, typically yellowish.

Distinctive fins

Anal fin with 2 spines and 12-13 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Opercular Spot

   The most reliable identification feature is the single, distinct, dark spot located just behind the gill cover. This spot is almost always present and clearly visible.

2. 2

   Body Shape and Coloration

   Look for a silvery, compressed body with a darker back and lighter belly. Faint vertical bars may be present, especially on live specimens.

3. 3

   Mouth and Chin

   The mouth is slightly inferior, and while small, inconspicuous barbels are present on the chin, they are not as prominent as in some other croaker species.

4. 4

   Fin Color

   The yellowish tint to the pectoral, pelvic, and anal fins can be a helpful secondary identifier.

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