The Characteristics And Pattern Of Paralytic Shellfish Toxin And Diarrhetic Shellfish Toxin In The Coast Of Guangdong Province

The poisoning and death events caused by the algae-derived toxins are sometimes reported around the world, in which Paralytic shellfish poisoning and Diarrhetic shellfish poisoning are the most life-threatening toxins. The two toxins also were detected out in several seas of Guangdong coast, but the shellfish poisoning monitoring programs suitable for Guangdong Province couldn't be established because of lacking data in the consistency of temporal and spatial distribution of the two toxins. Therefore, the contents of PSP and DSP in 307 samples collected from 27 sampling sites in Guangdong coast during 2005- 2006 were determined in order to understand the patterns of the two toxins. The conclusions can be drawn as follows:Part one: distributing characteristics of PSP in Guangdong coast.Firstly, the concentrations of PSP in Guangdong coast were generally low and under the the public health safety standard (400 MU/100g). Secondly, the seasonal change of PSP was quite obvious, and the positive rate mainly presented in spring, and other seasons scarcely. Lastly, the geographical distribution of PSP covered a wide area, almost including all the seas in Guangdong coast.Part two: distributing characteristics of DSP in Guangdong coast.Firstly, DSP in Guangdong coast had a higher detection rate and larger detection values, which existed in a half or above of samples. Secondly, Positive rate and the over-standard rate of samples changed in different seasons, but the two had some comparability in the aspact of seasonal change. Thirdly, the positive rates and over-standard rate in eastern area of Guangdong both were the highest, and the second the middle area, and the last the western area. Lastly, the positive and over-standard rate in samples species were 61.19% and 46.27%, relatively, and the highest toxicity was 0.8 MU/g, much higher than the public healthy safety standard(0.05 MU/g).The results of the present study can be practicable for the development of marine aquaculture, the diet safety of shellfish and the establishment of shellfish poisoning monitoring program, and provide scientific references for the policy of related management...