How to Identify Seaweed Blenny

To identify Seaweed Blenny (Parablennius marmoreus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable, typically mottled brown, green, or grey with darker blotches and spots, providing excellent camouflage. Some individuals may exhibit reddish or yellowish hues. Males often display more vibrant colors during breeding season.

Scale type

none

Mouth position

terminal

Distinctive features

Prominent cirri (fleshy filaments) above the eyes and on the nape (back of the neck)., Large eyes set high on the head., Terminal mouth with comb-like teeth., Absence of scales.

Dorsal fin

Long, continuous dorsal fin with 11-12 spines and 16-18 soft rays. A distinct notch often separates the spiny and soft-rayed portions.

Tail fin

Rounded caudal fin.

Pectoral fin

Large, fan-like pectoral fins.

Distinctive fins

Pelvic fins are jugular (located anterior to the pectoral fins) and modified into short, thick rays.

Identification Tips

1. 1

   Cirri

   Look for the distinctive branched cirri above the eyes and on the nape. The number and branching pattern can be a key identifier.

2. 2

   Coloration and Pattern

   Observe the mottled, cryptic coloration that helps it blend with seaweed and rocks. The specific pattern of blotches and spots can be unique to the species.

3. 3

   Dorsal Fin

   Note the long, continuous dorsal fin with a noticeable notch between the spiny and soft-rayed portions.

4. 4

   Body Shape

   Its elongated, somewhat compressed body is typical of blennies, but combined with other features, it aids identification.

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