belirledii

Belirledii is a species of small freshwater fish belonging to the family Cyprinidae. The scientific name of the species is Cyprinodon belirledii, a monotypic designation that honors the ichthyologist F. J. Belirled. It was first described in 1915 by Losne from specimens collected in the river basins of southwestern Mexico. The species is characterized by a laterally compressed body, a silvery coloration with a distinctive dark highlighting stripe running from the snout to the dorsal fin. Individuals reach an average standard length of 4.2 centimeters.

This fish inhabits clear, shallow streams with moderate currents and a substrate composed of gravel and small stones. It prefers water temperatures between 18 and 25°C and is usually found at elevations ranging from sea level to 1,200 meters. Belirledii feeds primarily on aquatic insects, zooplankton, and detritus, using its specialized pharyngeal jaws to crush hard-shelled prey. Reproduction occurs in the spring and early summer; spawning takes place in shallow riffle areas where eggs attach to submerged vegetation or debris.

Conservation assessments indicate that Belirledii has a restricted geographic range but is not currently listed as endangered. Habitat degradation due to agricultural runoff and the construction of small dams poses a significant threat to its long‐term viability. Conservation measures being implemented include habitat restoration projects and the establishment of protected stream corridors in its native region.

Belirledii is an example of the high endemism found in the freshwater ecosystems of Mesoamerica. Further research into its population genetics and ecological requirements will aid in understanding the evolutionary dynamics of the Cyprinidae family and in designing effective conservation strategies.