日本沼虾幼虾对碱度和pH的适应性

采用急性毒性实验法，研究日本沼虾（Macrobrachium nipponense）对碱度和DH的适应能力，探讨内陆盐碱水域养殖的可能性。结果表明，pH对幼虾的24、48、72、96h半数致死值分别为10．13、9．72、9．67和9．51，安全与适应范围分别为5．26～8．67、5．10～8．84。碱度对幼虾的24h半数有效浓度为17．96mmol／L，95％置信限14．60—22．53mmol／L；24、48、96h半数致死浓度分别为48．95、45．15和44．96mmol／L，95％置信限分别为45．72～50．60、39．46～51．67及34．34～55．38mmol／L，安全碱度11．52mmol／L。结果表明，在pH≤9．0、碱度≤20．0mmol／L的内陆盐碱水域，可以养殖日本沼虾。

Adaptability of Macrobrachium nipponense Juvenile to Water Alkalinity and pH

Acute toxicity of pH and alkalinity to freshwater shrimp Macrobrachium nipponense juveniles was determined in indoor by one-way toxicity test.The results showed that the median lethal pH(LpH_(50))for 24,48,72 and 96?hours to juvenile shrimp were 10.13,9.72,9.67 and 9.51,respectively.The safe pH was from 5.26 to 8.67,and pH adapted was from 5.10 to 8.84.The median effect concentration(EC_(50))(with 95% confidence intervals)for 24 hours of alkalinity to juvenile shrimp was 17.96(from 14.60 to 22.53)mmol/L.The median lethal concentration(LC_(50))(with 95% confidence intervals)for 24,48 and 96 hours of alkalinity to juvenile shrimp were 48.95(from 45.72 to 50.60),45.15(from 39.46 to 51.67)and 44.96(from 34.34 to 55.38)mmol/L respectively.The safe concentration(SC)of alkalinity to juvenile shrimp was 11.52?mmol/L.Freshwater shrimp M.nipponense can be cultivated in inland saline-alkali waters with pH of 9.0 and under,alkalinity of 20.0?mmol/L and under.