A growing population of snakehead fish has raised concern in a northwestern Sri Lankan village after the invasive species was detected in large numbers in the Deduru Oya reservoir about two years ago. The species, which is normally found in Southeast Asia, was believed by local officials to have entered the country through imported ornamental fish that were released when they became too large for home tanks. According to researcher Dr. Kelum Wijenayake, the snakehead fish has no natural predator in Sri Lanka and has become a dominant species in the freshwater food chain. Fishermen in the area reported a significant decline in native fish and shellfish that once supported local livelihoods. One snakehead was reported to weigh around seven kilograms, which is much larger than most native freshwater species. These conditions increased concern among experts because the invasive fish consumes large amounts of native aquatic life and threatens long-term ecological stability.

The population continues to expand due to warm water, abundant food, and limited biological resistance. The species is able to breathe atmospheric oxygen, survive in shallow water, and feed aggressively, creating both environmental and economic challenges for surrounding communities. Local fishers suggested that angler tourism could serve as a long-term method to control the species while offering alternative income. Some producers have already processed the fish into salted dried products that have become increasingly popular in nearby markets. Experts stated that expanded harvesting may help reduce the snakehead population and protect traditional fisheries from further damage.