 Xenotoca

Xenotoca is a genus of fish in the family Goodeidae from Mexico, where found in a wide range of habitats, from rivers and creeks to pools and lakes, in the Lerma–Grande de Santiago, Panuco, Cuitzeo and other basins of the Mesa Central.While no goodeid is a very common aquarium fish, the redtail splitfin ("X. eiseni"), is one of the most common aquarium goodeids.