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在水温30的条件下,用8个盐度梯度(4、7、10、13、16、19、22、25)的育苗用水进行罗氏沼虾人工育苗对比试验,结果表明:在7￣13的盐度范围内,罗氏沼虾幼体生长发育正常,变态时间均值为181d,而过高或过低盐度明显延长变态时间,且存活率很低;用淡水孵化罗氏沼虾幼体,每天增加盐度2￣10,幼体的生长发育和变态与育苗盐度始终保持在10的对照组相比没有显著差异;罗氏沼虾在盐度为10的水体中孵化并发育到第期后,每天降低盐度2直到变态,幼体变态时间平均缩短2￣3d,且变态同步性较高。研究表明,罗氏沼虾幼体对盐度变化有较强的适应能力,因此在低盐度条件下进行罗氏沼虾生产性育苗是可行的,本研究可明显节约罗氏沼虾育苗过程中的海水用量,降低育苗成本,为内陆地区大面积推广罗氏沼虾养殖提供了一定的技术依据。
Under the condition of water temperature 30, comparative experiments on artificial breeding of Macrobrachium rosenbergii were carried out with eight salinity gradients (4, 7, 10, 13, 16, 19, 22, 25) Within the salinity range, the growth and development of M. rosenbergii larvae were normal and the mean time of metamorphosis was 181 days. However, when the salinity was too high or too low, the metamorphosis time was significantly prolonged and the survival rate was very low. 2 ~ 10, larvae growth and metamorphosis and seedling salinity remained at 10 compared to the control group no significant difference; Macrobrachium rosenbergii in the salinity of 10 in the incubation and development to the first phase, the daily salinity 2 until metamorphosis, larvae on average shorten the 2 ~ 3d, and metamorphosis higher. Studies have shown that Macrobrachium rosenbergii has a strong ability to adapt to changes in salinity, so the production of seedlings of Macrobrachium rosenbergii is feasible under low salinity conditions. This study can significantly reduce the amount of seawater used during the nursery process of Macrobrachium rosenbergii , Reduce the cost of nursery, and provide a technical basis for large-scale popularization of Macrobrachium rosenbergii in inland areas.