The government is accelerating efforts to monitor the 'blackchin tilapia' along the Bang Saphan coast in Prachuap Khiri Khan Province. Authorities have ordered expanded surveys and the establishment of preventive measures to protect the marine ecosystem after the species was found to have spread for at least seven years. Surveys at three sites found an average of 61 individuals per 100 square meters.
On 25 June 2026, Ms. Lalida Pertvivatana, Deputy Spokesperson of the Prime Minister's Office, disclosed that the government under the leadership of Prime Minister and Minister of Interior Anutin Charnvirakul places great importance on preventing and controlling the spread of invasive alien species to protect biodiversity and maintain the balance of the marine ecosystem. Mr. Suchart Chomklin, Minister of Natural Resources and Environment, has ordered the Department of Marine and Coastal Resources (DMCR) to urgently investigate after receiving reports that ‘blackchin tilapia’ were found near the Bang Saphan deep-sea port in Prachuap Khiri Khan Province. The ministry is also rapidly assessing the situation and formulating systematic measures to prevent negative impacts.
An on-site inspection of the reported location, less than one nautical mile from shore with a depth of about 12 meters, found no blackchin tilapia there. However, after consulting local fishermen and officials, it was confirmed that blackchin tilapia have been spreading along the nearby coastline for no less than seven years. The DMCR therefore expanded surveys to four nearby coastal sites.
The survey found blackchin tilapia at three sites but not at one coral reef area near the shore. Population density averaged 61 individuals per 100 square meters, with an average body length of 13.40 centimeters and average weight of 68.60 grams; some specimens weighed up to 315 grams. Additionally, blackchin tilapia were observed coexisting with various native aquatic species, making close monitoring of ecological impacts essential.
The Deputy Government Spokesperson added that the Ministry of Natural Resources and Environment has instructed the DMCR to continuously monitor and track the spread of blackchin tilapia, using survey data to assess the situation and implement appropriate preventive measures to reduce impacts on marine resources, biodiversity, and the livelihoods of coastal communities.
“The government prioritizes managing invasive alien species based on scientific data, combined with collaboration across all sectors to prevent spread and reduce harm to the country’s natural resources. The public and fishermen are urged to report sightings of blackchin tilapia or other invasive species along the coast to local authorities or the Forest and Marine Protection Hotline 1362, available 24 hours, so relevant agencies can respond promptly and effectively.”