Toxicity Response and Swimming Speed Regularity in After Short-Term Exposure to Diuron.

The agricultural production process contributes to the global issue of pesticide pollution. Based on the static toxicity test of diuron (DCMU) on () for EC-48 h, a concentration range of 0.2 to 1 mg/L was set as sublethal concentrations, while lethal concentrations were set at 2 mg/L and 4 mg/L. This study analyzes the toxic response patterns of the swimming behavior indicators of exposed to different concentrations of DCMU. The results showed that the average speed (V) of decreased step by step with exposure time, regardless of exposure to sublethal concentration or lethal concentration. However, during the same short-term exposure period, the V of at lethal concentration was higher than that at sublethal concentration, which indicates that the swimming behavior of exposed to DCMU may be stimulated and accelerated. Compared to the control group, there is a statistically significant difference in the V of after short-term exposure, especially showing an extremely significant difference after 5 min of exposure. Evidently, compared to the traditional 48 h static toxicity testing method, the swimming behavior indicators of show a more sensitive response to DCMU after 5 min of exposure, making it more suitable for rapid toxicity detection. By expanding the range of exposure concentrations, it was found that the V indicator of responded significantly to a DCMU concentration of 0.05 mg/L after only 5 min of exposure, and a high degree of correlation was observed between the indicator and the exposure concentration. Through nonlinear fitting, the relationship between V and the dose-effect of DCMU toxicity presents an S-shaped curve, with R > 0.9. Consequently, it becomes possible to study the dose-effect relationship between the changes in the swimming behavior indicators of and the stress concentration based on this theory. This further establishes a foundation for the development of comprehensive aquatic toxicity rapid detection technology based on the toxic response of swimming behavior indicators.