An invasive species of snakehead fish has created concern in a northwestern Sri Lankan village after large numbers were detected in the Deduru Oya reservoir about two years ago. The species, usually found in Southeast Asia, was believed by local officials to have entered the country through imported ornamental fish that were released after outgrowing home tanks. Researcher Dr. Kelum Wijenayake explained that the snakehead fish lacks a natural predator in Sri Lanka and now occupies a dominant place in the freshwater food chain. Fishermen reported a decline in traditional fish and shellfish that previously supported local livelihoods. One specimen reportedly reached seven kilograms, far larger than native species that generally weigh under one kilogram. These developments intensified concern because the species consumes large quantities of native aquatic life and threatens ecological stability that formed over centuries.

The expansion of the snakehead population has continued due to favorable breeding conditions, abundant food sources, and minimal biological resistance. The species can breathe atmospheric oxygen, survive in shallow water, and display aggressive feeding behavior, creating environmental and economic challenges for surrounding communities. Local fishers proposed that angler tourism could operate as a sustainable measure to limit the population while providing alternative income. Some producers have already processed the fish into salted dried products that have gained popularity in nearby markets. Experts stated that increased harvesting may help restrain the species and reduce its detrimental impact on traditional fisheries. These findings underscore the need for coordinated action to preserve ecological balance and support long-term ecological resilience.