The Shark Catfish, also known as Wallago, is a large freshwater catfish native to Sri Lanka and other parts of South Asia. In Sri Lanka, it is found in major rivers, reservoirs, lakes, and deep freshwater habitats with slow-moving water. It prefers deep pools, muddy bottoms, and areas with submerged logs, rocks, or vegetation where it can shelter and ambush prey. This powerful predatory catfish has an elongated body, a large mouth, and strong swimming ability. It is mainly active during the night and uses its barbels and sensitive body system to detect prey in dark waters. Its diet consists mainly of fish, frogs, crustaceans, and other aquatic animals. The Shark Catfish is one of Sri Lanka’s largest native freshwater predators and plays an important role in regulating fish populations within river and reservoir ecosystems. Due to habitat loss, overfishing, and declining freshwater environments, this species requires conservation attention in many areas.