Eighteen samplings of sea water and green mussels were collected as well as 18 water analysis for nutrients and plankton composition. Eighteen mouse bioassay tests were likewise conducted. From July to August 1989, an increase in the number of pyrodinium bahamense motile cells in the two collection sites of Bataan were observed. Positive results were obtained for saxitoxin. Tests showed that saxitoxin concentration in mussels is dependent upon presence of the dinoflagellates.Results of the physico-chemical analysis of water revealed a significant increase in amount of certain elements in the bay water. Decrease in these amounts coincided with a decrease in pyrodinium cells. It is then hypothesized that an analysis of elements in sea water can provide an effective monitoring system to predict possible red tide outbreaks.
The study aims to: (1)develop an effective monitoring/surveillance system for the detection of the causative organisms of paralytic shellfish poisoning (PSP) in and around the Manila Bay area with the ultimate aim of predicting future outbreaks; (2)determine the level of toxicity of mussels collected periodically in established station by the mouse bioassay.