How to Identify Bicolor Blenny

To identify Bicolor Blenny (Ecsenius bicolor), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The anterior half of the body is typically dark brown, black, or deep blue, transitioning abruptly to a bright orange, red, or yellow posterior half, including the caudal fin. Color intensity can vary based on mood, health, and geographic location. Some individuals may exhibit a more uniform dark coloration or a less distinct bicolor pattern.

Scale type

none

Mouth position

inferior

Distinctive features

Prominent cirri (small fleshy filaments) above the eyes, though less elaborate than some other blenny species., A single, continuous dorsal fin., Small, comb-like teeth (hence 'combtooth blenny')., Often perches on its pelvic fins.

Dorsal fin

Single, long dorsal fin with 11-12 spines and 14-16 soft rays. The spiny and soft-rayed portions are continuous.

Tail fin

Rounded caudal fin.

Pectoral fin

Large, fan-like pectoral fins used for perching and maneuvering.

Distinctive fins

Pelvic fins are jugular (located anterior to the pectoral fins) and modified into thick, fleshy rays used for support and perching.

Identification Tips

1. 1

   Coloration

   The most defining feature is the distinct two-toned body, typically dark anterior and bright orange/yellow posterior. However, be aware of color variations.

2. 2

   Body Shape

   Elongated, slender body typical of blennies, with a relatively large head.

3. 3

   Behavior

   Often seen perching on rocks or corals, using their pelvic fins for support, and darting into holes when startled.

4. 4

   Size

   Small fish, rarely exceeding 11 cm (4.3 inches) in total length.

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