How to Identify Green Blenny

To identify Green Blenny (Scartichthys viridis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable, typically mottled green, brown, and grey, allowing for excellent camouflage against rocky substrates and algae. Some individuals may exhibit reddish or yellowish hues. Often has irregular dark bands or spots along the body.

Scale type

none

Mouth position

terminal

Distinctive features

Prominent cirri (fleshy filaments) on the head, particularly above the eyes and on the nape., Large eyes positioned dorsally., Terminal mouth with comb-like teeth.

Dorsal fin

Long, continuous dorsal fin with numerous flexible spines and soft rays. Typically XI-XII spines, 18-20 soft rays.

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 consist of a spine and 3-4 soft rays.

Identification Tips

1. 1

   Head Cirri

   Look for the distinctive fleshy filaments (cirri) on the head, especially above the eyes and on the nape. The number and branching pattern of these cirri can be a key identifier.

2. 2

   Coloration and Pattern

   Observe the mottled green, brown, and grey coloration, which provides excellent camouflage. Irregular dark bands or spots are common.

3. 3

   Fin Structure

   Note the long, continuous dorsal fin and the jugular pelvic fins (located forward of the pectoral fins).

4. 4

   Habitat

   Its presence in intertidal and shallow subtidal rocky areas along the Chilean coast is a strong indicator.

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