淡化方式与盐度对凡纳对虾幼虾生长的影响

不同的淡化方式与盐度影响凡纳对虾幼虾成活率与生长。以虹吸法边进边出的渐变方式进行淡化，效果最好，成活率达95．0%。适合于规模化生产的淡化方式为每6小时淡化一次，平均每小时降盐速度0．76，成活率达83．3％;体长为0．59-2．22cm、体重为8．12～30．12mg的幼虾具有相同的耐受降盐能力；幼虾生长的最适盐度范围为7．5～24．6，合适盐度范围为4．9～36．3，可适盐度范围为0．59～36．3。幼虾也可在淡水中生长(S：0．59，0．62)，饲养2ld，平均体长增长率与体重增长率分别为67．5％～73．0％与599．5％～615．6％，成活率达88．4％～90．0％。

Effects of desalination method and salinity on survival rate and growth of Penaeus vannamei juvenile

The different desalination methods and salinities had an effect on survival rate and growth of Penaeus Vannamei juvenile. The best result, 95.0% of survival rate, was obtained by siphoning , intaking while flowing out. The desalination method feasible for the large scale of production was desalinating once every 6 hours and the rate of reduced salinity was 0.76/h. This salinity method got 83.3% of the survival rate. The different size of juvenile (body length: 0.59-2.22cm, weight: 8.12-30.12mg) had the same ability to tolerate the reduced salinities. The suitable range of salinities for the growth of Penaeus vannamei juvenile was 4.9-36.3, the most optimum 7.5-24.6,the juvenile could adapt to 0.59-36.3 of salinity range. Penaeus vannamei juvenile can grow in freshwater (S:0.59,0.62) where after 21d the increase rate of body length was 67.5%-73.0%, the increase rate 599.5%-615.6% for body weight, and survived rate 88.4%-90.0% larvae.