How to Identify Bonga Shad

To identify Bonga Shad (Ethmalosa fimbriata), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery flanks, darker bluish-green dorsum. A prominent dark spot is typically present behind the upper part of the operculum. Fins are generally hyaline (transparent) or dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Deep, compressed body., Large, cycloid scales., A single, prominent dark spot behind the upper operculum., Short, deep head with a relatively small, terminal mouth., Pectoral fins are relatively long.

Dorsal fin

Single dorsal fin, typically with 15-19 soft rays. Originates slightly anterior to the pelvic fin origin.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Long, reaching beyond the origin of the dorsal fin, with 15-17 rays.

Distinctive fins

Pelvic fins are small, located abdominally, with 8 rays. Anal fin is relatively long with 19-24 soft rays.

Identification Tips

1. 1

   Body Shape

   Look for a noticeably deep and compressed body, typical of many clupeids, but more pronounced than some other sardine-like species.

2. 2

   Opercular Spot

   The most reliable distinguishing feature is the single, prominent dark spot located just behind the upper part of the gill cover (operculum).

3. 3

   Scales

   Observe the large, cycloid scales, which are easily shed.

4. 4

   Fin Ray Counts

   For precise identification, count the fin rays: Dorsal (15-19), Anal (19-24), Pectoral (15-17).

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