Golden skiffia, El Molino Pond

Golden Skiffia Skiffia francesae

Also known as: Tiro dorado

Max Size: 4.3–5 cm (1.7–2 in)

A tiny Mexican goodeid that looks like it was dipped in molten gold. Mature males develop a brilliant golden body overlaid with a soft gray cast that becomes especially intense during courtship. Their dorsal and anal fins are enlarged and characteristically notched (the classic “splitfin” of the Goodeidae), while both sexes show a crisp black crescent at the base of the caudal fin. Females and juveniles are more subdued — soft gray-green with scattered black flecks — but share the same distinctive wedge-shaped head and upturned lips perfectly adapted for grazing.

Origin & Habitat Endemic to Jalisco, western Mexico. The type locality (and source of nearly all aquarium stock) is the Río Teuchitlán, a tributary of the Río Ameca. A second population was discovered in 2007 by Omar Domínguez-Domínguez at the El Molino spring pond near Cuyucapán (also spelled Cuyacapán) in the endorheic Laguna de Sayula basin, roughly 80 km south of Teuchitlán.

This El Molino / Sayula population (recognized as a separate Evolutionary Significant Unit, or ESU, designated Skifr2) showed interesting variation: some individuals matched typical golden S. francesae, while others displayed pigmentation more reminiscent of the closely related Skiffia multipunctata. Genetically, however, they clustered closer to S. francesae than to multipunctata. The El Molino pond dried completely during a 2010 drought caused by water overexploitation, wiping out the last known wild population of this lineage. The type (Teuchitlán) population is designated Skifr1. Both ESUs are Extinct in the Wild.

Diet Primarily a benthic grazer. In the wild it feeds on pennate diatoms, filamentous algae, and aufwuchs scraped from rocks and plant surfaces. In the aquarium it accepts high-quality flakes, algae wafers, blanched vegetables, and small live or frozen foods.

Behavior & Temperament Peaceful, mid-to-bottom oriented, and best kept in small groups with a female-heavy ratio. Males display their golden intensity most dramatically when courting. Do not house with S. multipunctata, as the two species can hybridize.

Reproduction Ovoviviparous livebearer. Gestation lasts 55–60 days; females typically produce 10–15 well-developed young (occasionally 5–20). Young are born with trophotaenia (temporary nutrient-exchange structures) that are lost shortly after birth. Sexual maturity is reached around five months.

Conservation Status IUCN: Extinct in the Wild (EW).

The species disappeared from its habitats due to pollution, water extraction, habitat modification, and competition from invasive species (especially Xiphophorus maculatus). It survived solely in aquarium and conservation breeding programs. Most captive stocks descend from the original Teuchitlán (Skifr1) collections; pure El Molino / Sayula (Skifr2) lineages remain scarce in captivity.

In November 2022, approximately 1,200 captive-bred golden skiffias (primarily Skifr1) were released back into restored sections of the Teuchitlán River during Mexico’s Day of the Dead celebrations as part of the Fish Ark Mexico project. Habitat restoration and monitoring continue, with further releases and hatchery expansion underway. Efforts focused on the Sayula lineage have also begun more recently. The golden skiffia remains officially Extinct in the Wild, but it is once again swimming in parts of its ancestral range — a true “back from the dead” story that includes two distinct lineages.

A shimmering, conservation-priority livebearer that combines striking male coloration, unique goodeid biology, and one of the most inspiring recovery narratives in the freshwater aquarium world.