Longstriped Blenny

Overview

The longstriped blenny (Parablennius rouxi) is a small, slender marine fish primarily found in the Mediterranean Sea and parts of the Northeast Atlantic. It is a common, bottom-dwelling species that typically inhabits shallow rocky environments and coralligenous substrates.

Appearance

This species is characterized by a thin, elongated body, typically light beige or whitish in color, featuring a distinct dark longitudinal stripe that runs from the forehead to the tail. Above each eye, it possesses a branched tentacle, which is generally longer in males. Males can also be identified by a dark blue or greenish patch located at the front of their single, long dorsal fin, as well as fine blue markings on the snout.

Distribution & habitat

The longstriped blenny is endemic to the Mediterranean and also occurs off the coast of Portugal. It favors hard substrates, including smooth rocks, scree, and coralligenous formations, often occupying narrow holes or crevices in these surfaces.

Biology & behavior

These fish are solitary and territorial, with males often claiming and defending specific holes or crevices. During the breeding season, which occurs from May to July, males perform elaborate courtship displays, including vertical swimming and jumping in and out of their chosen holes to attract females. Once eggs are laid, the male guards them until they hatch. They are diurnal and primarily feed on algae, periphyton, and small invertebrates such as crustaceans and worms.