How to Identify Indian River Shad

To identify Indian River Shad (Clupeidae), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery flanks, darker bluish-green dorsum. Often a faint dark spot behind the operculum in some individuals.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Deeply compressed body, Keeled belly with prominent scutes (28-31 pre-pelvic, 12-15 post-pelvic), Absence of a dark spot on the shoulder (though some individuals may have a faint one), Last dorsal fin ray not elongated, Pectoral fins relatively short

Dorsal fin

Single, short-based dorsal fin, typically with 17-19 soft rays.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Short, with 13-15 soft rays.

Distinctive fins

Pelvic fins small, abdominal in position.

Identification Tips

1. 1

   Body Shape

   Look for a distinctly deep and compressed body, typical of many clupeids.

2. 2

   Scutes

   Feel the sharp, serrated scutes along the belly, a characteristic feature of shad and herring.

3. 3

   Dorsal Fin

   Note the single, relatively short dorsal fin without an elongated last ray.

4. 4

   Coloration

   Observe the overall silvery body with a darker back. The absence of prominent dark spots (other than a possible faint opercular spot) helps distinguish it from some other clupeids.

5. 5

   Size

   Adults typically reach a maximum standard length of about 25-30 cm, though most caught are smaller.

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