不同鱼类对凤眼莲生长以及水质的影响

Effect of different fishes on growth of Eichhornia crassipes and the water quality

凤眼莲的过度生长已经成为水生态系统灾害之一。通过模拟实验,研究鳊、鲫、草鱼等对凤眼莲生长以及水质的影响。研究结果显示,实验期间,对照组、鳊组、鲫组、草鱼组的凤眼莲平均相对生长率分别为46.1、35.3、40.4和14.6 mg·(g·d)^(-1),鳊组和草鱼组平均相对生长率显著低于对照组。实验结束时,实验组水体中溶解性总氮和溶解性总磷浓度与对照组没有显著差异。研究表明利用草鱼和鳊既可以抑制凤眼莲生长,同时又能够净化污染水体。

The rapid growth and spread of water hyacinth（ Eichhornia crassipes） has been disastrous for many aquatic ecological systems around the world. Studies of the effects of three fish species（ Parabramis pekinensis,Carassius auratus,and Ctenopharyngodon idellus） on the growth rates of E. crassipes were conducted in a simulation experiment. The results showed that the relative growth rates of E. crassipes in control,P. pekinensis,C. auratus,and C. idellus treatment groups were 46. 1 mg·（ g·d）^-1,35. 3 mg·（ g·d）^-1,40. 4 mg·（ g·d）^-1,and14. 6 mg·（ g·d）^-1 ,respectively. The relative growth rates of E. crassipes in the P. pekinensis and C. idellus treatment groups were significantly lower than the growth rate in the control group. Additionally,water quality tests showed that there were no significant differences in the levels of dissolved total nitrogen and phosphorus between all treatment groups and the control groups at the end of the experiment. The results of this study suggest that C. idellus and P. pekinensis could be useful for inhibiting the growth of E. crassipes in impacted water bodies.