How to Identify Climbing Perch

To identify Climbing Perch (Anabas testudineus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Generally dull olive-green to brownish-grey on the dorsal side, fading to lighter shades on the ventral side. Often exhibits faint vertical bands or blotches, especially when stressed or young. A dark spot is typically present on the caudal peduncle and sometimes at the base of the pectoral fin.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Presence of a suprabranchial (labyrinth) organ for aerial respiration., Rough, ctenoid scales., Strong, spiny operculum (gill cover) that can be locked in an open position, aiding in terrestrial locomotion., Robust, spiny fins.

Dorsal fin

Single, long dorsal fin with 16-20 strong spines and 8-10 soft rays. The spiny portion is longer than the soft-rayed portion.

Tail fin

Rounded to slightly emarginate caudal fin.

Pectoral fin

Well-developed, rounded pectoral fins.

Distinctive fins

Pelvic fins are thoracic, with one spine and five soft rays. Anal fin is similar to the dorsal fin, with 9-11 spines and 9-11 soft rays.

Identification Tips

1. 1

   Labyrinth Organ

   While not externally visible, the ability to survive out of water for extended periods is a key indicator. If observed 'walking' on land, it is almost certainly Anabas testudineus.

2. 2

   Opercular Spines

   The gill covers (operculum) are armed with sharp, serrated spines that are easily felt and can cause injury. These are crucial for its terrestrial locomotion.

3. 3

   Body Shape and Coloration

   Its robust, somewhat compressed body, dull brownish-grey to olive coloration, and often a dark spot on the caudal peduncle are characteristic.

4. 4

   Fin Structure

   The long dorsal and anal fins, both with prominent spiny rays, are distinctive.

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