A large earthen and rock dam enlarged the original pool, and a series of seeps and secondary outflows created distributaries that ran 1–1.5 km (0.62–0.93 mi) downstream.

[3][4] In addition, the introduced goldfish (Carassius auratus) had sustained a small population from its introduction (which may have occurred before 1961), and largemouth bass (Micropterus salmoides),[2] which had become common in the deeper central pond, with some individuals growing to 30 cm (12 in) in total length.

From 1968 to 1983 the ecosystem remained relatively stable, with water levels fluctuating 0.2-0.3 meters, and losing 10% of the pond's surface area.

Potosi pupfish are maintained in aquariums in both North America and Europe, and can be used as a basis for reintroducing it back into the wild in the future.

Dorsal and anal fin of nuptial male has milky white edge, pelvic is bluish.