How to Identify Ganges River Shad

To identify Ganges River Shad (Gonialosa manmina), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Overall silvery, often with a darker dorsal surface and lighter ventral side. Fins are typically hyaline (transparent) or dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

A series of prominent scutes (bony plates) along the ventral midline, from the isthmus to the anus, numbering 28-31., A distinct black spot often present behind the upper part of the gill opening, though sometimes faint or absent., Small, terminal mouth., Absence of a lateral line.

Dorsal fin

Single, short-based dorsal fin located mid-body, typically with 13-15 soft rays.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Relatively small, located low on the body, with 13-15 rays.

Distinctive fins

Pelvic fins are small, abdominal, with 8 rays. Anal fin is short, located posterior to the dorsal fin, with 17-20 rays.

Identification Tips

1. 1

   Ventral Scutes

   Count the number of sharp, bony scutes along the belly. Gonialosa manmina typically has 28-31 scutes, a key diagnostic feature for the genus and species.

2. 2

   Body Shape and Size

   Small, highly compressed, silvery body. Maximum standard length usually around 10-15 cm, rarely exceeding 20 cm.

3. 3

   Black Shoulder Spot

   Look for a dark, often indistinct, spot behind the upper operculum. While not always prominent, its presence can aid identification.

4. 4

   Mouth Position

   The mouth is small and terminal, indicating its planktivorous feeding habit.

Explore Ganges River Shad