Segmented Sailfin Blenny

The Segmented Sailfin Blenny is a hardworking algae-grazing blenny found throughout the Indo-Pacific region. Its body displays a mottled pattern of brown, tan, and olive tones, often with faint banding or segmented markings along the flanks that give the species its common name. The dorsal fin is notably tall and can be raised into a sail-like display, particularly during territorial encounters or courtship. The face features the characteristic blunt profile of Salarias blennies, with thick algae-scraping lips and large, prominently positioned eyes.

In the wild, the Segmented Sailfin Blenny inhabits shallow reef flats, lagoons, and rubble zones where it grazes incessantly on filamentous algae, microalgae, and diatoms. Like its close relative the Lawnmower Blenny (Salarias fasciatus), it is a tireless herbivore that spends virtually every waking moment methodically scraping algae from hard surfaces. This relentless grazing behavior makes it one of the most effective biological algae control agents available for reef aquariums, keeping rockwork clean and preventing the establishment of nuisance algae.

The Segmented Sailfin Blenny is an excellent choice for reef aquariums of 30 gallons or more that have established live rock with natural algae growth. It is completely reef-safe, hardy, and adapts well to aquarium life. Its peaceful temperament makes it compatible with most community reef fish, though it may defend its grazing territory against other herbivorous blennies. Ensure adequate supplemental feeding with vegetable-based foods if natural algae growth is limited, as this species can decline in condition if its primary food source is depleted.