Speoplatyrhinus poulsoni

**Alabama Cavefish (Speoplatyrhinus poulsoni)** The Alabama Cavefish is a small, highly specialized freshwater fish measuring approximately 5-6 centimeters in length. This cave-adapted species exhibits typical troglodytic characteristics including reduced pigmentation, appearing translucent to pale pink, and vestigial eyes covered by skin. Its elongated snout and enhanced lateral line system help it navigate and locate food in complete darkness. The species feeds on small invertebrates and organic matter within its cave environment, playing a role as both predator and scavenger in the limited cave ecosystem. This endemic species inhabits underground waters in Key Cave, located in Lauderdale County, Alabama. The cave system connects to the Tennessee River watershed, and the fish occupies pools and streams within the limestone cave network. Its entire known range is restricted to this single cave system, making it one of the most geographically limited vertebrate species in North America. The primary threats include groundwater contamination from agricultural runoff and residential development in the surrounding watershed. Sedimentation from surface activities can alter water quality and flow patterns within the cave. The species' extreme habitat specificity and tiny range make it vulnerable to any environmental changes, including potential impacts from climate change affecting groundwater levels. Key Cave was designated as a National Wildlife Refuge in 1997, providing federal protection for the habitat. Water quality monitoring and watershed management efforts help address contamination risks. Research continues on the species' ecology and population status. The Alabama Cavefish remains critically endangered with an uncertain population trend, though habitat protection measures provide some conservation foundation for this highly vulnerable endemic species.