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| Toxicity and Safety Evaluation of Two Pesticides against Red Swamp Crayfish Procambarus clarkii and Chinese Mitten Crab Eriocheir sinensis |
| LU Jian, ZHANG Jiajia, WANG Peipei, QING Hui, ZHOU Guoqin |
| Institute of Fisheries Science of Nanjing, Nanjing 210036, China |
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Abstract The acute toxicity of imidacloprid and phoxim to red swamp crayfish Procambarus clarkii and Chinese mitten crab Eriocheir sinensis at room temperature was studied by using the semi-static aquatic organism acute toxicity test method. The results showed that the LC50 of imidacloprid against red swamp crayfish at 24 h, 48 h, 72 h and 96 h was 35.949 mg/L, 26.193 mg/L, 12.320 mg/L and 3.547 mg/L, respectively, with the safe concentration of 0.354 mg/L. The LC50 of phoxim in 24 h, 48h, 72 h and 96 h of red swamp crayfish was 0.018 mg/L, 0.013 mg/L, 0.012 mg/L and 0.010 mg/L, respectively, with safe concentration of 0.001 mg/L. The LC50 of imidacloprid against Chinese mitten crab at 24 h, 48 h, 72 h and 96 h were 432.252 mg/L, 280.366 mg/L, 211.01 mg/L, and 171.831 mg/L, respectively, with the safe concentration of 17.183 mg/L. The LC50 of phoxim in 24 h, 48 h, 72 h and 96 h of Chinese mitten crab were 3.051 mg/L, 2.326 mg/L, 1.817 mg/L and 1.294 mg/L, respectively, with the safe concentration of 0.129 mg/L. Combined with national standards and the experimental data, it can be seen that imidacloprid is a poisonous, low and medium risk grade for red swamp crayfish, and phoxim is highly toxic and extremely high risk grade for red swamp crayfish; that imidacloprid is low-risk grade for Chinese mitten crab, phoxim is a poisoned, medium-risk grade for Chinese mitten crab.
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Received: 24 September 2019
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