Lawnmower Blenny Identification Guide
Identify the Lawnmower Blenny by its mottled camouflage pattern, elongated body, and comb-like eye cirri.
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Key identification features
- Elongated, tapering body reaching about 5 inches (13 cm)
- Mottled brown, tan, and olive camouflage pattern with darker blotches and faint bars
- Small, branched, comb-like cirri (fleshy tufts) above each eye
- Large eyes set high on a blunt head, with a downturned mouth adapted for grazing algae
- No scales visible in typical light, giving a smooth, soft-bodied look
- Usually seen perched still on rock, algae turf, or sand rather than swimming freely
- Coloring can shift slightly paler or darker depending on the surrounding substrate
Common look-alikes
- Bicolor Blenny: similarly shaped, but shows a cleaner two-tone body split between dark front and orange-yellow rear rather than mottled camouflage
- Horned Blenny: has similar cirri and camouflage tones, but sports larger, more elaborate branched cirri and a more compressed body profile
Where you'll see one
Lawnmower Blennies live on shallow reef flats, lagoons, and rubble areas across the Indo-Pacific, where they perch motionless on algae-covered rock or coral rubble, grazing on turf algae during the day.
Frequently asked questions
How do I tell a Lawnmower Blenny from a Bicolor Blenny?
The Lawnmower Blenny shows mottled brown camouflage all over, while the Bicolor Blenny has a clean split between a dark front and orange-yellow rear.
What behavior helps confirm a Lawnmower Blenny sighting?
Look for a fish perched motionless on algae-covered rock or rubble, grazing with quick head movements rather than swimming in open water.