By Kenneth Marcos 
Families living along coastal towns of Zamboanga, Samar, and Surigao are being warned to avoid eating shellfish and alamang after new tests confirmed the continued presence of toxic red tide in several bays.
According to the latest Shellfish Bulletin No. 22, Series of 2025, released on October 24 by the Bureau of Fisheries and Aquatic Resources (BFAR), shellfish samples collected from Dumanquillas Bay in Zamboanga del Sur, Tantanang Bay in Zamboanga Sibugay, Zumarraga Island and Matarinao Bay in Eastern Samar remain positive for paralytic shellfish poison (PSP), commonly known as red tide toxin.
The agency also announced that Lianga Bay in Surigao del Sur has now tested positive for PSP, making it the newest addition to the list of affected coastal areas.
BFAR warned that all types of shellfish and Acetes sp. or alamang gathered from these locations are not safe for human consumption. Eating contaminated shellfish can cause paralysis and, in severe cases, death.
However, the bureau clarified that fish, squid, shrimp, and crabs from these same waters remain safe to eat, as long as they are fresh, thoroughly washed, and cleaned properly before cooking. Consumers are reminded to remove internal organs such as gills and intestines where the toxins tend to accumulate.
Red tide occurs when harmful algae bloom and produce natural toxins that can contaminate shellfish and other marine organisms. While the algae are not always visible, their effects can be deadly. Symptoms of PSP poisoning include tingling of the lips and tongue, dizziness, difficulty breathing, and in extreme cases, respiratory failure.
BFAR continues to monitor affected coastal areas through its regional offices. The agency advises local government units to strictly enforce shellfish bans and inform coastal communities about the risks. Vendors and market-goers are also urged to buy seafood only from BFAR-certified sources.
Residents who suspect shellfish poisoning are advised to seek immediate medical attention. Public awareness and vigilance remain crucial in preventing red tide-related illnesses, especially in fishing communities where seafood is a daily source of food and income.
The public may check BFAR’s official website and social media pages for real-time updates on red tide warnings and Shellfish Bulletins.
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