reported that recent seawater samples collected from the coastal waters of the island no longer have traces of Pyrodinium bahamense, a dinoflagellate known for producing the red tide toxin.

On the other hand, the seawater of Calbayog City in Samar was found to have Pyrodinium bahamense, a dinoflagellate that produces red tide toxin. The area is included in the local shellfish bulletin.