HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesSplitfinsPatzcuaro allotoca Patzcuaro allotoca (Allotoca diazi) Scientific name: Allotoca diazi Meek, 1902 The Patzcuaro allotoca (Allotoca diazi) is a freshwater fish of the family Goodeidae. In the aquarium it needs water at 22–27°C (72–81°F). Native range: Central America, endemic to the Lerma River basin, Mexico. Patzcuaro allotoca care at a glanceTemperature22–27°C (72–81°F) Species factsScientific nameAllotoca diaziFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length10.0EnvironmentFreshwater; brackish;; pH range: 6.8 - 7.4; dH range: 5 - 10 demersalClimateTropicalDistributionCentral America: endemic to the Lerma River basin, Mexico.Conservation status (IUCN)Critically Endangered (CR) (B1ab(iii)+2ab(iii))Threat 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