HomeFish encyclopediaRay-finned fishesPerch-like fishCombtooth blenniesRock blenny Rock blenny (Entomacrodus chiostictus) Scientific name: Entomacrodus chiostictus Jordan & Gilbert, 1882 The Rock blenny (Entomacrodus chiostictus) is a marine fish of the family Blenniidae. Native range: Eastern Central Pacific, Gulf of California to Panama, including offshore islands such as Tres Marias, Revillagigedo, Clipperton, and Cocos. BiologyInhabits shallow, weed-covered rocky reefs, including tide pools. Oviparous. Eggs are demersal and adhesive.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEntomacrodus chiostictusFamilyBlenniidae (Combtooth blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length7.5EnvironmentMarine; reef-associatedClimateTropicalDistributionEastern Central Pacific: Gulf of California to Panama, including offshore islands such as Tres Marias, Revillagigedo, Clipperton, and Cocos.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026