鱼体(去鳃)和鱼鳃对不同形态铜的积累特征

Accumulation of copper in the fish body with gill removed and the fish gill

:在实验室条件下研究实验鱼Paracheirodon对人工河水中不同形态铜的积累特征,对比了鱼体(去鳃)和鱼鳃对铜吸收量的差异,并探讨了鱼对铜的吸收机理。研究结果表明,实验鱼鳃部和体内铜积累量均随水相游离铜浓度增高、暴露时间增长而增加,但鳃部积累浓度较鱼体其余部分高一个数量级,其从水相富集铜的速率显著高于鱼体。相比之下,经摄食获取的铜首先积累在鱼体内(非鳃部)。天然水中富里酸的存在明显降低了铜对鱼的有效性。

The accumulation and absorption kinetics of copper by the fish body with gill removed and the fish gill from both water and food were tested in laboratory conditions.The effects of copper concentration in the water and food, and the existence of fulvic acid on the absorption were investigated.It was demonstrated that the amount of copper accumulated in both fish body and gill increased with the increase in copper concentration in water and food,and exposure duration up to a level above which the normal physiological activity of fish was inhibited.With fulvic in the system,the absorption rate decreased significantly, indicating that the fulvic combined copper is not available to the fish uptake.