黄鳝对盐碱耐受性的研究

Salinity and alkalinity tolerance of Monopterus albus

采用概率单位法研究了盐、碱对黄鳝(Monopterus albus)的急性毒性作用,采用相加指数法研究了盐碱联合作用对黄鳝的影响,并且研究了驯化黄鳝对盐度的耐受性。结果表明:盐度对黄鳝((11.82±1.51)g/尾)24 h、48 h、72 h、96 h的半致死浓度(LC50)分别为17.63 g/L、16.29 g/L、15.62 g/L、15.46 g/L,其安全浓度是4.17g/L;个体大的黄鳝24 h、48 h、72 h、96 h半致死盐度比个体小的黄鳝对应值高。碱度对黄鳝((11.59±1.43)g/尾)24 h、48 h、72 h、96 h的半致死浓度分别为9.17 g/L、9.98 g/L、7.07 g/L、6.38 g/L,其安全浓度是1.92 g/L。盐碱在1∶1质量浓度混合后,对黄鳝的作用效果在不同时间段均表现为一定的拮抗作用,其安全浓度是3.48 g/L。经过梯度驯化后,黄鳝耐盐能力有所提高。利用盐碱地和咸水进行黄鳝养殖有较好的发展前景。

The acute toxicity of salinity and alkalinity on ricefield eels was studied by the probit method,and combined effects of salinity and alkalinity was investigated by the additive index method,and furthermore the tolerance to salinity acclimation of Monopterus albus was studied. The results were showed： 24 h,48 h,72 h and 96 h half lethal concentration（ LC50） of salinity was 17. 63 g/L,16. 29 g/L,15. 62 g/L,15. 46 g/L respectively,and safe concentration was 4. 32 g/ L when eel weight was（ 11. 82 ± 1. 51） g; 24 h,48 h,72 h,96 h LC50of salinity of large eel were higher than corresponding values of small eel 24 h,48 h,72 h and 96 h LC50of alkalinity was 9. 17 g / L,9. 98 g / L,7. 07 g / L,6. 38 g / L respectively,and safe concentration was 1. 92 g / L when eel weight was（ 11. 59 ± 1. 43） g. Effect of salinity and alkalinity on ricefield eels in different periods showed a certain antagonism after they were mixed with 1∶ 1 mass concentration,and the safe concentration was 3. 48 g / L. After gradient acclimation,salt tolerance of ricefield eel improved. Therefore,ricefield eel aquaculture had good prospects in sal- alkality soil and salty water.