Jenynsia diphyes
Overview
A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.
Jenynsia diphyes faces severe population decline due to habitat degradation from agricultural runoff and urban development in its limited freshwater range. Water pollution from pesticides and fertilizers has significantly reduced water quality in the shallow coastal streams and lagoons where this species breeds. Dam construction and water extraction for irrigation have altered natural flow patterns, fragmenting populations and reducing suitable spawning habitat.
Habitat
This freshwater fish inhabits shallow coastal streams, lagoons, and wetlands in southeastern South America, particularly in areas with slow-moving or still water and abundant vegetation. The species prefers brackish to freshwater environments near river mouths and coastal plains where salinity levels fluctuate naturally.