盐度对脊尾白虾存活、生长和蜕壳的影响

    Effects of salinity on survival, growth and molt of Exopalaemon carinicauda

    • 摘要: 研究了盐度突变对脊尾白虾成活的影响,以及水体盐度(0、6%、12%、18%)对单个体养殖条件下脊尾白虾生长、成活和蜕壳的影响。结果表明:(1)盐度由6%到0 的突变组,脊尾白虾的成活率最低,96 h成活率仅为6.67%;而盐度由6%至12%、18%的突变组,96 h的成活率均在93%以上。(2)单个体养殖试验结果表明,随着水体盐度提高(盐度0~12%条件下),脊尾白虾最终体长、总体长增长率和成活率均有增加趋势;盐度超过12%时,总体长增长率显著下降,但成活率变化不大。(3)盐度对脊尾白虾的蜕壳周期有一定影响,盐度12%组虾的第1 次、第5 次、第8 次和第9 次蜕壳周期最长;整体上,盐度12%组平均蜕壳周期最长(9.57 d),盐度0 组平均蜕壳周期相对较短(8.47 d)。因此,脊尾白虾对盐度低于6%的水体适应性较差,盐度12%有利于提高该虾的生长速度和成活率。

       

      Abstract: This study firtly investigated the effect of salinity shock on survival of Exopalaemon carinicauda, and then examined the effects of different salinities (0, 6%, 12% and 18%) on growth, survival and molt of E. carinicauda by individual culture. The results showed that, (1) When salinity dropped from 6% to 0, the survival rate of E. carinicauda was the lowest, 96 h survival rate was only 6.67%. While when salinity was from 6% to 12%or 18%, 96 h survival rates were above 93%. (2) The results of individual breeding experiment showed that, under the salinity of 0-12%, final body length, body length growth rate(GR) and survival rate of E. carinicauda increased with the salinity increasing; when the salinity exceeded 12%, the GR decreased significantly, but the survival rate had no significant change. (3) Salinity had a certain of effect on the molting cycle of E. carinicauda, and the shrimps from salinity 12% treatment had the longest molting cycle during the first, fifth, eighth and ninth molting. In generally, the shrimps from salinity 12% had the longest molting cycle (9.57 days), while shrimps from salinity 0 treatment had the shortest one (8.47 days). Therefore, E. carinicauda has poor adaptability with the water salinity of less than 6%;and salinity 12% is the optimal level for the growth and survival of E. carinicauda.