HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesCortez triplefin Cortez triplefin (Axoclinus nigricaudus) Scientific name: Axoclinus nigricaudus Allen & Robertson, 1991 The Cortez triplefin (Axoclinus nigricaudus) is a marine fish of the family Tripterygiidae. Native range: Eastern Central Pacific, Gulf of California. BiologyCommon in the intertidal zone. Feeds on tiny invertebrates and algae.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAxoclinus nigricaudusFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.5Depth range0–3 m (0–10 ft)EnvironmentMarine; demersal; depth range 0 - 3 mClimateTropicalDistributionEastern Central Pacific: Gulf of California.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