Endangered
Redtail splitfin
Xenotoca eiseni
While no goodeid species is a very popular aquarium fish, the redtail splitfin is one of the most popular.
Appearance
The upper part of the body and head are olive-brownish to dusky. A broad, poorly defined bluish-black band runs from the gill cover to the tail, but it virtually disappears on the mid-body region. The throat and belly or yellowish to whitish.
Females grow to 7 centimeters (2.8 inches) while males grow to 6 centimeters (2.4 inches) total length.
Range and habitat
The redtail splitfin comes from west-central Mexico in the Grande de Santiago River basin and waters near Compostela, Nayarit. It might also occur in the uppermost Ameca and Armería River basins, but the taxonomic position of these populations remains unclear. Two additional populations, one from an endorheic basin in the Etzatlán region and another from the Coahuayana River, were formerly included in this species, but in 2016 they were described as X. Doadrioi and X. Lyonsi respectively.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Breeding
In the wild, both male and female redtail splitfins prefer to mate with fish of similar size.
In crisis
Redtail splitfin is Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Redtail splitfin, Wikidata item Q806299. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
