【摘要】 分析了盐度对凡纳滨对虾Litopenaeus vannam ei(Boone)生长、耐低氧能力及一些免疫指标的影响.实验结果表明,其它环境因子相对恒定的条件下,凡纳滨对虾能在盐度5~30范围内生存、生长,其中:在盐度15~25环境中生长较快;盐度为25时凡纳滨对虾耐低氧能力最好,盐度下降至5时,耐低氧能力显著下降;5~10的低盐环境使凡纳滨对虾血细胞密度、溶菌活力明显下降,在盐度15~25的环境中凡纳滨对虾抗菌活力、溶菌活力最高,PO活性和SOD活性表达与体液抗菌活力、溶菌活力没有直接相关性.β-葡聚糖可提高凡纳滨对虾对低盐度和盐度变化的适应能力,但对个体生长没有影响.更多还原

【Abstract】 The growth rates and several indexes involved in immune function of the shrimp,Litopenaeus vannamei,exposed to different salinity levels for 50 d were analyzed.The shrimp could live in water with a salinity ranging from 5 to 30 and gained some growth normally.The optimal salinities for the animal were 15~25,in which the shrimp got a high growth rate level,a great endurance for low dissolved oxygen and a great antibacterial action and bacteriolysis,while the phenoloxidase activity and superoxide dismutase activity of the shrimp appeared lower level.Low salinities 5~10 could create an immunosuppressive state by significantly decreasing the bacteriolysis and reducing total haemocyte count of the shrimp.However,taking in β-glucan preparation by diet would enhance resistance to low salinity level and salinity transformation,while it didn’t seem to contribute to the growth of the animal.更多还原