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( MO2)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。
Swimming behavior of juvenile silver carp (Hypophthalmichthys molitrix) exposed to cadmium
In this investigation, the eco-toxicological effects of cadmium on the swimming performances of juvenile silver carp ( Hypophthalmichthys molitrix) were measured. Cadmium concentrations were measured in tissues ( gill, liver and muscle) . The relative critical swimming speed ( Ucrit ) , as well as oxygen metabolic rate ( MO2 ) range were measured in juvenile silver carp after a 96 h exposure to a range of cadmium concentrations (0, 0. 36, 0. 73, 1. 09 and 1. 46 mg/L). The results showed that cadmium exposure had significant effects on the cadmium concentrations in tissues, especially, in the liver (F=4. 32, P=0. 038). Besides, cadmium exposure had significant effects on the Ucrit and MO2 range. The Ucrit was 30. 25% of the control after 96 h exposure to1. 46 mg/L cadmium. The correlation coefficients of critical swim-ming speed and cadmium accumulation in gill and muscle tissue were negative, -0. 96 (P=0. 01) and 0. 90 (P=0. 04) respectively. The metabolic range increased with the increasing of cadmium concentration. At 1. 46 mg/L of cadmium ex-posure, the metabolic range increased by 19. 32% than that of the control. The results indicated that cadmium exposure <br> would have significant effects on swimming capabilities and the metabolic rate of juvenile silver carp. Cadmium has inhibi-tory effect on juvenile silver carp behavior, and low Cd concentrations exposure resulted in gill and muscle damage, and caused a decrease in oxygen metabolic efficiency, aerobic capacity and swimming ability of juvenile silver carp.
cadmiumHypophthalmichthys molitrixcritical swimming speedoxygen metabolic rate range
NETL
NSTL
万方数据
维普
