HomeFish encyclopediaRay-finned fishesPerch-like fishPike-, tube- and flagblenniesHancock's blenny Hancock's blenny (Acanthemblemaria hancocki) Scientific name: Acanthemblemaria hancocki Myers & Reid, 1936 The Hancock's blenny (Acanthemblemaria hancocki) is a marine fish of the family Chaenopsidae. Native range: Eastern Central Pacific, Costa Rica and Panama. BiologyInhabits empty worm and tube mollusk tubes on rocky reefs. Feeds on zooplankton.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAcanthemblemaria hancockiFamilyChaenopsidae (Pike-, tube- and flagblennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.5Depth range1–5 m (3–16 ft)EnvironmentMarine; reef-associated; depth range 1 - 5 mClimateTropicalDistributionEastern Central Pacific: Costa Rica and Panama.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026