How to Identify Deep-bodied silverbiddy

To identify Deep-bodied silverbiddy (Gerres Erythoura), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Overall silvery, often with a faint dusky blotch on the upper side. The caudal fin is typically yellowish to reddish, especially noticeable in younger individuals. Fins are generally hyaline (transparent) to dusky.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Deep, compressed body, with body depth typically 2.0-2.4 times in standard length (SL)., Highly protrusible mouth., Large, silvery scales., Reddish or yellowish caudal fin, particularly in juveniles and subadults., A series of faint, dusky vertical bars or blotches may be present on the flanks, especially when stressed or in certain lighting.

Dorsal fin

Single dorsal fin with 9-10 spines and 10-12 soft rays. The second dorsal spine is notably elongated, often the longest, and can be as long as or longer than the head.

Tail fin

Deeply forked caudal fin, with lobes often yellowish to reddish.

Pectoral fin

Long and pointed, reaching beyond the anal fin origin.

Distinctive fins

Pelvic fins are thoracic, with one spine and five soft rays. Anal fin has 3 spines and 7-8 soft rays.

Identification Tips

1. 1

   Body Depth

   Its deep body, with a depth-to-standard-length ratio of 2.0-2.4, distinguishes it from more slender Gerres species.

2. 2

   Second Dorsal Spine

   The elongated second dorsal spine, often as long as or longer than the head, is a key diagnostic feature.

3. 3

   Caudal Fin Coloration

   The yellowish to reddish caudal fin, especially in younger individuals, is a good indicator.

4. 4

   Mouth Protrusion

   Observe its highly protrusible mouth, characteristic of the Gerreidae family, used for sifting through substrate.

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