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为了探讨水体镉(Cd)污染对鱼类的生态毒理效应,在实验室条件下,测定了不同浓度Cd(0、0.36、0.73、1.09和1.46 mg/L)暴露对鲢(Hypophthalmichthys molitrix)幼鱼半致死浓度、组织(肝、鳃、肌肉)Cd累积量、相对临界游泳速度(Ucrit)、以及耗氧率(MO_2)的影响。结果显示:Cd暴露导致重金属在幼鱼组织中累积,与对照组比较,Cd在鳃和肌肉中累积量差异不显著;肝脏中累积量差异显著,暴露浓度为0.73 mg/L时肝脏中镉累积量最高。鲢幼鱼相对临界游泳速度随着Cd暴露增加显著降低,浓度为1.46 mg/L时Ucrit为对照组的69.75%。临界游泳速度与鳃和肌肉组织中镉累积量呈显著负相关,相关系数分别为-0.96(P=0.01)和-0.90(P=0.04)。Cd暴露导致鲢幼鱼耗氧代谢范围增加,暴露浓度为0.73 mg/L时耗氧代谢范围较对照组增加了19.32%。低浓度Cd暴露导致鳃和肌肉损伤,并引起鲢幼鱼游泳过程中耗氧代谢效率降低,有氧运动能力和游泳能力下降。
In order to investigate the ecotoxicological effects of cadmium (Cd) pollution on fish, under laboratory conditions, the effects of Cd (0,0.36,0.73,1.09 and 1.46 mg / L) exposure on the growth of silver carp (Hypophthalmichthys molitrix) Semi-lethal concentration of fish, accumulation of Cd (liver, gill, muscle), relative critical swimming speed (Ucrit) and oxygen consumption rate (MO 2) The results showed that: Cd exposure led to the accumulation of heavy metals in juvenile fish, compared with the control group, Cd accumulation in the gill and muscle showed no significant difference; the cumulative amount of liver significant differences in the exposure concentration of 0.73 mg / L of cadmium accumulation in the liver The highest volume. The relative critical swimming speed of juvenile silver carp was significantly decreased with the increase of Cd exposure, Ucrit was 69.75% of the control group at the concentration of 1.46 mg / L. There was a significant negative correlation between critical swimming speed and cadmium accumulation in gills and muscle tissue with correlation coefficients of -0.96 (P = 0.01) and -0.90 (P = 0.04), respectively. Exposure to Cd led to increased oxygen consumption of silver carp juveniles. Exposure to 0.73 mg / L increased the oxygen consumption by 19.32% over the control. Exposure to low concentrations of Cd led to gill and muscle damage, and caused the reduction of aerobic metabolism, aerobic exercise capacity and swimming ability of young silver carp during swimming.