CHIANG RAI – The AI CARE Research Cluster recently released comprehensive test results regarding water animal safety in the Kok River. They proudly reported that almost all fish meat easily passes strict heavy metal safety standards. The organization hopes these positive results will quickly reassure worried local communities.
Consumers can confidently eat the fish meat harvested safely from this northern region. However, health experts strongly advise people to avoid eating fish guts due to dangerous lead and arsenic levels. Consuming these toxic heavy metals severely damages the human nervous system over time.
Key Takeaways
- Fish meat from the Kok River remains overwhelmingly safe, with 126 of 127 samples passing heavy metal tests.
- Researchers discovered alarming levels of toxic lead and arsenic inside fish entrails across Chiang Mai and Chiang Rai.
- Health officials urge locals to completely remove all fish intestines before cooking traditional dishes like fermented fish.
Assoc. Prof. Dr. Tanapon Penrat and Ajarn Saranporn Kerdkoh publicly shared these critical findings on November 4, 2026. Dr. Tanapon directs the Data and Digital System Mission Unit for the Thailand Science Research and Innovation (TSRI). Ajarn Saranporn teaches International Business Management at Naresuan University International College.
Their dedicated team carefully collected the latest water animal samples on October 15, 2026. The researchers subsequently analyzed 259 accumulated samples gathered painstakingly over the past twelve months. They specifically targeted dangerous heavy metals that threaten local food safety and public health.
Fortunately, the team found absolutely no heavy metal contamination in the fish meat during the recent rainy season. Only one historical meat sample failed the lead standard back in August 2025. The current tests confirm that the fish fillets remain remarkably clean today.
Alarmingly High Lead Levels Found in Fish Entrails
While the meat proves safe, the internal organs tell a much darker environmental story. The researchers tested 13 specific fish gut samples gathered throughout Chiang Mai province. They discovered that five of these samples contained entirely unacceptable levels of toxic lead.
This data means nearly forty percent of the Chiang Mai gut samples completely failed the safety check. The ongoing situation in neighboring Chiang Rai province also presents significant health risks to consumers. The team carefully examined 112 fish gut samples pulled directly from Chiang Rai waters.
They quickly found dangerous lead levels lurking in 26 of those Chiang Rai samples. Some specific fish guts contained up to 9.85 milligrams of lead per kilogram. This shocking chemical concentration exceeds the legal safety limit by nearly thirty-three times.
Health authorities warn that chronic lead exposure severely impacts brain development in young children. Adults who ingest lead face an increased risk of high blood pressure and kidney damage. Residents must take these recent scientific findings extremely seriously to protect their families.
Arsenic Contamination Adds to Local Health Concerns
Lead does not stand alone as the only dangerous heavy metal polluting the river system. Researchers also found excessive toxic arsenic in seven of the Chiang Rai entrail samples. The absolute highest arsenic reading reached a staggering 9.03 milligrams per kilogram.
This specific amount measures roughly four and a half times higher than the acceptable health standard. When combining data from both provinces, 32 out of 125 total gut samples failed the safety tests. Heavy metal pollution clearly remains actively scattered throughout the entire Kok River basin.
The environmental team also tested local crabs and snails within Chiang Rai province. They found one particular bitter shell snail that notably exceeded the strict arsenic limit. Officials strongly advise people to completely avoid eating snails from the specific Sop Ruak area.
Safe Cooking Practices Protect Your Family’s Health
The AI CARE organization advises everyone to carefully remove all fish intestines before beginning to cook. You must properly gut the fish whether you plan to grill, steam, or mince the meat. Traditional fermented Thai dishes like Pla Chom also absolutely require completely gutted small fish.
Furthermore, you should always cook the seafood thoroughly to successfully kill any harmful parasites. Eating raw fish routinely exposes you to dangerous pathogens and potentially severe stomach illnesses. However, consumers must remember that extreme heat never actually destroys heavy metals like lead or arsenic.
Therefore, choosing the right physical parts of the fish remains your absolute best defense. The official November 2026 risk assessment fully clears the fish meat for normal daily consumption. However, the comprehensive report strictly warns against eating any fish guts sourced from Chiang Rai.
Authorities also demand a complete stop to eating or selling fish guts within Chiang Mai. AI CARE urgently asks all local restaurant owners to source their raw ingredients carefully. Everyone must actively track these water quality updates to continuously protect our public health.
