日本沼虾幼虾的耐盐性研究

Salinity tolerance of juvenile prawn Macrobrachium nipponense

在人工养殖条件下，研究了日本沼虾幼虾（体长为2．0～2．5cm）在不同盐度条件下的平均死亡时间（MST）、半数死亡时间（ST50）、半致死盐度（MLS）以及生长率和成活率。结果表明：日本沼虾在盐度为32、34、36条件下的MST分别为19.63、6．63、2．93h；在盐度为30、32、34、36条件下的ST50分别为26．67、11．27、2．60、1．53h；MLS-24、MLS-48、MLS-72、MLS-96分别为30．71、26．66、26．31、25，80；当盐度为12时，日本沼虾幼虾的增长率和增重率最高。这说明日本沼虾的耐盐性较高，能在盐度较高的水域中养殖。

The adaptability of juvenile prawn Macrobrachium nipponense to different salinities was determined under artificial cultural condition. The mean mortality time （MST） was found to be 19.63, 6.63, and 2.93 h at a salinity of 32, 34, and 36 for the prawn, respectively. At a salinity of 30, 32, 34, and 36, the median mortality time （ST50） was 26.67, 11.27, 2.60, and 1.53 h, respectively, and the median lethal salinity （MLS） 30.71, 26.66, 26.31, and 25.80 at 24, 48, 72 and 96 h. The maximal growth in body length and body weight was observed at a salinity of 12, indicating the juveniles had high tolerance to salinity and was cultured at high salinity area of waters.