How to Identify Deepwater cardinalfish

To identify Deepwater cardinalfish (Epigonus telescopus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally dark brown to black, often with a purplish or iridescent sheen, particularly on the operculum and flanks. The fins are typically dark.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Very large, prominent eyes, adapted for low light conditions., Two distinct dorsal fins., A relatively large mouth extending to below the eye., Smooth, cycloid scales.

Dorsal fin

Two dorsal fins; the first dorsal fin has 7-8 spines, and the second dorsal fin has 1 spine and 9-11 soft rays. The two fins are distinctly separated.

Tail fin

Caudal fin is forked.

Pectoral fin

Pectoral fins are moderately long, with 16-20 rays.

Distinctive fins

Pelvic fins are thoracic, with 1 spine and 5 soft rays.

Identification Tips

1. 1

   Eyes

   Look for exceptionally large, almost telescopic eyes, which are a key adaptation to its deep-sea habitat.

2. 2

   Coloration

   Its uniform dark brown to black body color is characteristic, often with a subtle metallic sheen.

3. 3

   Dorsal Fins

   Note the presence of two clearly separated dorsal fins, with the first being spiny and the second having one spine and soft rays.

4. 4

   Body Shape

   The body is elongated and somewhat compressed, typical of many deep-sea fish.

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