| In this study, we focused on the accumulative rate,discharge rate of Paralytic Shellfish Poisoning (PSP) produced by Alexandrium tamatense in Venerupis Philippinaram and transformation mechanism within different PSP components. Consequently simulation culture experiments in 2 different feeding mode were designed. In one case Venerupis Philippinaram was fed by Alexandrium tamatense solely, in another case, it was fed by Alexandrium tamatense,Prorocentrum donghaiense,Chaetoceros minutissimus with the proportion of 1:1:1. The main results are as follows:The PSP accumulative rate in the Venerupis Philippinaram increases rapidly till the upper limit with the increase of Alexandrium tamatense cell abundance in all cases. However, if the cell abundance of Alexandrium tamatense could keep the PSP accumulation level in the Venerupis Philippinaram, no matter how fast the accumulative rate is, the PSP level will be over the Shellfish safely eatable standard (80μg STXeq/100g) definitely.The transformation of different PSP components in the same shellfish seems complex to describe. In this study, we find the transformative rate of GTX1 and GTX4 which are the isomeric compounds respectively have a strong relationship with the physiological state of the shellfish. For example, in the second case which non-toxic algae exist, the transformative rate is higher than the first case because of slight damage to the shellfish. Whereas there's an equilibrium transformative ratio that could be reached and maintained continuously if the time is enough.Venerupis Philippinaram does not present the food selectivity obviously with all kinds of algae in total cases. The non-toxic algae does not stay the PSP accumulative rate in the shellfish effectively. However the PSP accumulative rate,discharge rate and transformation in different components could be influenced by the physiological state of the shellfish indirectly.
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