HomeFish encyclopediaRay-finned fishesClingfishesClingfishes and singleslitsGalapagos clingfish Galapagos clingfish (Arcos poecilophthalmos) Scientific name: Arcos poecilophthalmos Jenyns, 1842 The Galapagos clingfish (Arcos poecilophthalmos) is a marine fish of the family Gobiesocidae. Native range: Southeast Pacific, endemic to the Galapagos Islands. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 7; Anal spines: 0; Anal soft rays: 7Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameArcos poecilophthalmosFamilyGobiesocidae (Clingfishes and singleslits)OrderGobiesociformes (Clingfishes)ClassActinopterygii (Ray-finned fishes)Maximum length5.0Depth range5–30 m (16–98 ft)EnvironmentMarine; reef-associated; depth range 5 - 30 mClimateTropicalDistributionSoutheast Pacific: endemic to the Galapagos Islands.Conservation status (IUCN)Vulnerable (VU) (D2)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