HomeFish encyclopediaRay-finned fishesCusk eelsPearlfishesNocturnal pearlfish Nocturnal pearlfish (Echiodon exsilium) Scientific name: Echiodon exsilium Rosenblatt, 1961 The Nocturnal pearlfish (Echiodon exsilium) is a marine fish of the family Carapidae. Native range: Eastern Pacific, Baja California Sur, Mexico to Panama, including the Gulf of California and the Galapagos Islands. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 38-42; Anal spines: 0; Anal soft rays: 47 - 50; Vertebrae: 130. Eel-like, shallow body depth; 1 to several symphyseal fangs on dentary and premaxilla; lacking cardiform teeth, pelvic fins, and swim bladder rocker bone; a patch of ridges posteriorly on the ventral surface of the swim bladder. Precaudal vertebrae 21-25. Branchiostegal rays: 7.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEchiodon exsiliumFamilyCarapidae (Pearlfishes)OrderOphidiiformes (Cusk eels)ClassActinopterygii (Ray-finned fishes)Maximum length12.6Depth range64–75 m (210–246 ft)EnvironmentMarine; demersal; depth range 64 - 75 mClimateTropicalDistributionEastern Pacific: Baja California Sur, Mexico to Panama, including the Gulf of California and the Galapagos Islands.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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