In Agricultural Chemical Regulation Law in Japan, the aquatic organisms (fish, Crustacean, algae) are treated as the target of the risk assessment, and Registration Withholding Standards (RWS) and Predicted Environment Concentration (PEC) in the public waters such as rivers are compared. RWS is the minimum value of the Acute Effect Concentrations (AEC) by using the active ingredients. Tier system is introduced in the estimation of PEC, from numerical computation to field experiment. When PEC is larger than RWS, the registration is withheld, and changes of usage are required. In addition, AEC values with formulation are used for instructions in the pesticide use. In the future, novel risk assessment methods that take into account Species Sensitivity Distributions (SSD) of native aquatic organisms and seasonal changes of pesticide concentration in domestic river basins will be needed to introduce a probabilistic way of thinking.

Risk assessment of pesticides on aquatic organisms in river basin in Japan

248th National Meeting (2014)

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