Blackline Blenny
Malacoctenus boehlkei
Type: saltwater, reef fish, benthic
Physical Characteristics
Elongated body with a continuous dorsal fin spanning most of its back. Features a reddish to brownish coloration with distinct vertical banding or mottling and a notable dark line or series of spots behind the eye. It has small cirri (fleshy growths) above the eyes and on the nape.
Habitat & Distribution
Inhabits coral reefs and rocky areas in the Western Atlantic, specifically the Caribbean, Florida, and the Bahamas. Preferred depths range from shallow tide pools to approximately 10-15 meters.
Size & Weight
Typically ranges from 3 to 6 centimeters (1.2 to 2.4 inches) in length; maximum size is roughly 7 centimeters. Weight is negligible, usually just a few grams.
Similar Looking Species
Saddleback Blenny (Malacoctenus triangulatus) which has more triangular markings, and various Labrisomid blennies which may lack the specific eye-line marking.
Ecological Role
Higher-level benthic consumer that helps control populations of small invertebrates and serves as prey for larger reef predators.
Diet
Carnivorous, primarily feeding on small crustaceans, mollusks, and polychaete worms found on the substrate.
Behavior
Solitary and highly territorial. They are diurnal and spend much of their time perched on rocks or coral heads using their pectoral fins to stay stationary in currents.
Reproduction
They are oviparous; females lay adhesive eggs in a nest, which are then guarded and aerated by the male until they hatch into planktonic larvae.
Conservation Status
Least Concern (IUCN); population trends appear stable across its geographic range.
Identification Tips
Look for a dark horizontal line extending from the posterior of the eye and the distinct comb-like arrangement of dorsal spines. The reddish hue and mottled vertical bars are also indicative.
Interesting Facts
These fish are known for their 'perching' behavior on reef surfaces. The cirri on their heads are thought to help break up the fish's outline, providing camouflage against the complex reef background.
Identified on: 6/14/2026
Mode: Standard