盐度波动和蛋白质/碳水化合物比值对凡纳滨对虾存活和生长的影响

本实验探讨了盐度波动（S0和S10）和蛋白质/碳水化合物比值（P/C：4.1、1.9、1.0和0.6）对凡纳滨对虾存活和生长的影响。实验周期35天。结果表明：I）随着饲料中P/C比值的降低,对虾特定生长率和吸收效率呈下降趋势,而饲料系数呈上升趋势。在盐度波动S0处理中,4.1P/C比值饲料组对虾的摄食量和特定生长率显著高于1.0和0.6P/C比值饲料组;而在盐度波动S10处理中,各P/C比值饲料处理组差异不显著。II）4.1和1.9P/C比值饲料处理组中,S0盐度波动处理组对虾的摄食量和特定生长率高于S10盐度波动处理组;而1.0和0.6P/C比值饲料处理组中,S0盐度波动处理组对虾的摄食量和特定生长率低于S10盐度波动处理组的对虾。对于4个P/C比值处理组,S0盐度波动处理组的对虾饲料系数最低。

Effects of salinity fluctuation and dietary protein/ carbohydrate ratio on the survival and growth of Juvenile Litopenaeus vannamei

A factorial study was conducted to determine the effects of salinity (constant (S0) and fluctuating (S10)) and isoenergetic diet of different protein/carbohydrate ratios (P/C: 4.1, 1.9, 1.0 and 0.6) on the survival and growth of juvenile Litopenaeus vannamei. The experiment lasted for 35 days. The results showed that I) At S0 and S10, specific growth rate and apparent digestibility coefficient exhibited decreasing trend, while food conversion ratio exhibited increasing trend, with decreasing P/C ratio. At S0, food consumption and specific growth rate of the shrimp fed 4.1 P/C were significantly higher than those fed 1.0 and 0.6 P/C, whereas at S10, no significant differences were detected among different treatments; II) At 4.1 and 1.9 P/C, food consumption and specific growth rate were higher in the shrimp maintained at S0 as compared with those at S10, while at 1.0 and 0.6 P/C, an inverse trend was observed. Among four P/C ratios, food conversion ratio of the shrimp at S0 was the lowest.