HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesSplitfinsOpal allotoca Opal allotoca (Allotoca dugesii) Scientific name: Allotoca dugesii Bean, 1887 The Opal allotoca (Allotoca dugesii) is a freshwater fish of the family Goodeidae. Native range: Central America, endemic to central highlands of Mexico (Jalisco, Guanajuato, Michoac?n, Aguascalientes). Species factsScientific nameAllotoca dugesiiFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length6.5EnvironmentFreshwater; demersalClimateTropicalDistributionCentral America: endemic to central highlands of Mexico (Jalisco, Guanajuato, Michoac?n, Aguascalientes).Conservation status (IUCN)Not EvaluatedThreat 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