Zingel asper

**Apron (Zingel asper)** The Apron is a small freshwater fish endemic to the Rhône River basin in France and Switzerland. This slender percid typically measures 12-22 cm in length, characterized by its elongated body, large pectoral fins, and distinctive spotted pattern along its flanks. The species exhibits benthic behavior, dwelling on rocky substrates where it feeds primarily on aquatic invertebrates, particularly mayfly and caddisfly larvae. As a specialized predator, the Apron plays an important role in maintaining the ecological balance of fast-flowing river ecosystems. Historically distributed throughout the upper Rhône basin, the Apron's range has contracted dramatically to just four river systems: the Rhône, Ain, Ardèche, and Durance rivers in France, plus the Doubs River on the French-Swiss border. The species requires well-oxygenated waters with strong currents and rocky or gravelly substrates, typically in river sections with depths of 0.5-3 meters. The Apron faces severe threats from habitat degradation caused by dam construction, river channelization, and water extraction, which have fragmented populations and altered natural flow regimes. Water pollution, particularly from agricultural runoff and urban discharge, has further compromised water quality in remaining habitats. Conservation efforts include habitat restoration projects, fish passage construction around dams, and captive breeding programs. French authorities have implemented protective legislation and established monitoring protocols to track remaining populations. The species' outlook remains precarious due to its extremely limited range and ongoing habitat pressures. Without sustained conservation intervention, the Apron faces a high risk of extinction within the coming decades.