Residues and risk assessment of pesticides in integrated rice-crayfish co-culture systems in Hubei Province
The residues of 19 pesticides in integrated rice and Procambarus clarkii breeding environ-ments in Hubei Province were investigated,and the ecological risk and dietary risks associated with P.clarkii in paddy fields were assessed.The results showed that three pesticides,β-666,δ-666 and endrin,were detected in the water samples from 22 sites of rice and P.clarkii farming,but most of these residues were attributed to earlier environmental residues.Four types of pesticides were detected in P.clarkii sam-ples,with one source linked to pesticide application on rice,and another related to the feed of P.clarkii.The order of dietary risk values for P.clarkii was hexachlorobenzene>HCHS>DDTs>pendimethal-in,with the dietary intake risks ranging from 0.002%to 0.206%.Therefore,the levels of pesticide resi-dues in the rice and P.clarkii breeding environments in Hubei Province are within a safe range,but the po-tential dietary risks associated with multi-route and long-term pesticide exposure to crawfish warrant ongo-ing attention.
integrated rice and crayfish breeding modelProcambarus clarkiipesticiderisk assess-mentdietary risk
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