Thai court orders blackchin tilapia containment to continue
Samut Songkhram must be declared a disaster area under a court ruling that residents plan to appeal over the exclusion of other provinces.
The Central Administrative Court on Tuesday (September 8, 2026) ordered fisheries authorities to continue containing the spread of blackchin tilapia and directed the interior minister to have Samut Songkhram declared a disaster area so affected communities can receive relief funding more quickly.
The disaster declaration would not extend to other affected provinces because the court found that the 54 plaintiffs neither lived nor worked in those areas.
Lawyers representing the residents said they were preparing to appeal that restriction. The judgment is not yet final.
The ruling concerned administrative case No. S.14/2567, brought against 18 state agencies, committees and officials. The plaintiffs alleged that failures to regulate imports of the fish and take legal action against the importer had allowed the invasive species to spread across several provinces, damaging livelihoods and causing hardship.
Containment plan must continue
Poramet Daendongying, who heads the Lawyers Council of Thailand’s working group handling the administrative case, said the court ordered the Department of Fisheries and its director-general to continue implementing the containment plan drawn up after the outbreak became severe.
He said the ruling placed responsibility on the department and its director-general as the authorities with direct statutory duties to address the problem.
Responsibility for declaring a disaster area rested with the Ministry of Interior. The court therefore ordered the interior minister to instruct the Samut Songkhram governor to make the declaration, allowing relief funds to be disbursed.
The court dismissed the other claims and the actions against the remaining respondents, including the Department of Marine and Coastal Resources and the Ministry of Finance.
Poramet said the judgment would take effect 180 days after the case becomes final. The parties have 30 days to appeal. If no appeal is filed within that period, the judgment will become final. If an appeal is lodged, the parties must await the Supreme Administrative Court’s judgment.
His team expected an appeal in a case of this significance. The plaintiffs were themselves preparing to challenge the exclusion of other affected provinces, citing the court’s earlier recognition that the 54 plaintiffs, who work in affected areas, had standing to protect natural resources and the environment.
Civil lawsuit seeks more than 2 billion baht
A parallel civil lawsuit seeks more than 2 billion baht in damages for more than 1,000 affected farmers in Samut Songkhram, with 10 representatives acting as plaintiffs.
Sittiporn Lelanapasak, a member and secretary of the Lawyers Council of Thailand’s Environmental Committee, said the case involved nine private-sector defendants, including a company and directors connected with the import of blackchin tilapia.
The South Bangkok Civil Court is scheduled to hear an order on September 14 on whether the lawsuit can proceed as a class action. The lower court had previously accepted it as a class action, but an appeal by a party to the case led to the forthcoming hearing on that status.
Early sightings and the dispute over imports
Blackchin tilapia are native to West Africa. Community representative Panya Tokthong previously said residents began finding the fish in Samut Songkhram’s canals, rivers and ponds in 2012, with the damage worsening in 2016 and 2017.
The outbreak drew parliamentary scrutiny in 2024. Charoen Pokphand Foods (CPF), which farmers have accused of causing the infestation and named in their civil lawsuit, acknowledged importing 2,000 blackchin tilapia from Ghana in December 2010 for research in Samut Songkhram. The company denies responsibility for their spread.
CPF has said the research project ended in January 2011 after the fish became weak and died, and that all remaining stock was destroyed. Its acknowledged research imports and the allegation that those imports caused the outbreak remain distinct issues; the company disputes the latter.
Eighteen state respondents and four principal demands
In the administrative proceedings, the plaintiffs sought four principal remedies: urgent action to contain the outbreak; an assessment of the damage and restoration of ecosystems; disaster-relief designation for affected areas; and state action to recover damages from the private parties involved.
The 18 respondents were:
- Department of Fisheries
- Director-General of the Department of Fisheries
- National Fisheries Policy Committee
- Department of Fisheries’ Institutional Committee on Biosafety and Biodiversity
- Ministry of Agriculture and Cooperatives
- Minister of Agriculture and Cooperatives
- Department of Marine and Coastal Resources
- Director-General of the Department of Marine and Coastal Resources
- Committee on Marine and Coastal Resources Management Policy and Planning
- Ministry of Natural Resources and Environment
- Minister of Natural Resources and Environment
- National Environment Board
- National Disaster Prevention and Mitigation Committee
- Department of Disaster Prevention and Mitigation
- Director-General of the Department of Disaster Prevention and Mitigation
- Ministry of Interior
- Minister of Interior
- Ministry of Finance
The court scheduled the reading of its first-instance judgment for 10am. The reading took about an hour, and the written judgment ran to more than 120 pages. Affected residents and community representatives attended alongside representatives of most respondents.
Former Department of Fisheries director-general Bancha Sukkaew attended in person. He did not comment on the ruling when approached by reporters afterwards.
Residents want restoration, not only compensation
Panya said residents were satisfied with the judgment to some extent because it required the authorities directly responsible to continue tackling the outbreak and directed the Ministry of Interior to arrange assistance for affected people in Samut Songkhram.
However, he remained concerned that the disaster-relief order did not cover other affected provinces.
The lawsuit was not simply about compensation, he said. Residents wanted the state to assess the damage, restore natural resources and ecosystems, and help farmers resume their normal livelihoods.
Panya regarded the judgment as a starting point for pressing the government to take concrete action, although the case was not final. Community networks would consult representatives from other affected provinces about their next steps, including an appeal.
