Lawnmower blenny

Lore & Background

Salarias fasciatus is typically olive to brown with dark bars and numerous round or elongated white spots of different sizes. It has many pale spots, dark streaks running anteriorly, and several dark bands. The dorsal fin lacks a notch, and the dorsal and anal fins are attached to the base of the caudal fin by a skin membrane. Adult males have elongated anterior rays on the anal fin. Dark longitudinal lines often appear on the front part of the body, while small bright blue spots with dark outlines mark the rear part. This species lives in reefs at depths of 0–8 m from East Africa and the Red Sea to Samoa and the Islands of Micronesia, most often on shallow reef flats that have heavy algae cover. It camouflages itself with its surroundings, even changing color to hide from predators. Despite its common name 'lawnmower blenny,' the fish is principally a detritivore, with plant material making up only about 15% of its diet. Georges Cuvier described it as Salarias quadripennis in 1816 and named it as the type species of the genus Salarias, but that name was shown to be a junior synonym of Bloch's Blennius fasciatus.

Reader's Guide

The lawnmower blenny is a small, benthic fish that reaches a maximum length of 14 cm. It is endemic to Australasia but has a broad Indo-Pacific distribution from East Africa and the Red Sea to Samoa and Micronesia, inhabiting shallow reef flats with heavy algae cover at depths of 0–8 m. In the reef ecosystem, it plays a role as a detritivore, consuming detritus and some algae (about 15% of its diet). Its ability to camouflage and change color helps it avoid predators. In the aquarium trade, it is known for consuming algae growth, though its primary diet is detritus. The species exhibits sexual dimorphism: adult males have elongated anterior rays on the anal fin. Its taxonomy includes a historical naming by Georges Cuvier as Salarias quadripennis, later recognized as a junior synonym of Blennius fasciatus described by Bloch.

Did You Know?

• Despite its common name, plant material makes up only about 15% of its diet; it is principally a detritivore.
• It can change color to camouflage itself from predators.
• Georges Cuvier described it as Salarias quadripennis in 1816, but that name is a junior synonym of Blennius fasciatus.