盐度与体重对台湾罗非鱼耗氧率的影响

在盐度为淡水、7、14、2 1、2 8和 35的条件下 ,测定了 3个体重组 (1.5 7～ 4.87g ,7.0 7～ 18.2 3g和31.5 0～ 5 2 .41g)的台湾红罗非鱼的耗氧率 ,方差分析表明 ,盐度对台湾红罗非鱼的耗氧率有极显著的影响(P <0 .0 1) .体重范围为 1.5 7～ 18.2 4g时 ,盐度 7实验组的耗氧率最高 ,分别为 0 .41mgO2 ·g-1·h-1(1.5 7～ 4.78g)和 0 .34mgO2 ·g-1·h-1(7.0 7～ 18.2 3g) ,体重范围为 31.5 0～ 5 2 .41g时 ,耗氧率最高值出现在盐度 35组 ,为 0 .30mgO2 ·g-1·h-1.耗氧率最低值也因体重范围的不同而出现在不同的盐度 ,体重范围为1.5 7～ 4.78g时 ,盐度 14组的耗氧率最低 ,为 0 .2 8mgO2 ·g-1·h-1,体重范围在 7.0 7～ 5 2 .41g时 ,耗氧率的最低值均出现在盐度 2 1组 ,其中体重范围 7.0 7～ 18.2 3g的最低值为 0 .2 2mgO2 ·g-1·h ,而体重范围31 5 0～ 5 2 .41g的最低耗氧率为 0 .13mgO2 ·g-1·h-1.协方差分析表明 ,盐度和体重对台湾红罗非鱼的耗氧率存在极显著的交互作用 (P <0 .0 1) .

Effect of salinity and body weight on the oxygen consumption of Oreochromis niloticus x O. mossambicus]

The effects of salinity and body weight on oxygen consumption of Taiwan red tilapia (Oreochromis niloticus x O. mossambicus) were studied. The fish was divided into three groups by their body weight: 1.57-4.87 g (G1), 7.07-18.23 g (G2) and 31.50-52.41 g (G3). The results showed that oxygen consumption at different salinities was significantly different (P < 0.01). The rates of oxygen consumption in G1 and G2 were highest, with 0.41 mg O2.g-1.h-1 for G1, and 0.34 mg O2.g-1.h-1 for G2 respectively at salinity 7@1000; while G3 had highest level with 0.30 mg O2.g-1.h-1 at 35@1000. The lowest oxygen consumption level appeared at different salinities with the different body weight. The lowest level in G1, 0.27 mg O2.g-1.h-1, appeared at salinity 14@1000. G2 and G3 had lowest oxygen consumption level at 21@1000, with 0.22 mg O2.g-1.h-1 and 0.13 mg O2.g-1.h-1 respectively. ANOV showed that oxygen consumption was significantly affected by the interaction of salinity and body weight.