The largest species of freshwater fish is the Beluga Sturgeon (Huso huso), which can grow to impressive lengths of over 20 feet and weigh more than 2,000 pounds. Native to the Caspian and Black Sea basins, this species is renowned for its large size and for producing highly sought-after caviar. However, the Beluga Sturgeon is currently classified as vulnerable due to overfishing, habitat loss, and environmental degradation. These factors underscore the importance of conservation efforts to protect this remarkable species and its ecosystem, allowing it to thrive in its natural habitat.