花尾胡椒鲷幼鱼的呼吸和排泄代谢

Respiratory and excretory metabolism of fish fry of yellow-spotted grunt Plectorhynchus cinctus

研究了不同环境条件对花尾胡椒鲷Plectorhynchus cinctus幼鱼耗氧率和排氨率的影响。试验结果表明,随着放养密度的增加,花尾胡椒鲷的耗氧率逐渐降低,耗氧率与放养密度的相关关系可用幂函数方程Y=8.1304X-1.0512(R2=0.9879)表达;排氨率呈先上升后下降的趋势,排氨率与放养密度的相关关系可用二次方程Y=-0.0047X2+0.0542X+0.0776(R2=0.5806)表达。花尾胡椒鲷幼鱼的耗氧率和排氨率随着鱼体重的增加而逐渐下降,体重与耗氧率和排氨率的相关关系可分别用幂函数方程式Y=2.163X-0.8495(R2=0.9273)和Y=0.2394X-1.0344(R2=0.7794)表达。白天平均耗氧率和排氨率低于夜间值,耗氧率的低谷值为高峰值的89.19%,排氨率的低谷值为高峰值的22.01%。花尾胡椒鲷的活动耗氧率为基础耗氧率的1.19～1.39倍,活动排氨率为基础排氨率的1.23～1.96倍。

Effect of environmental factors on the oxygen consumption and ammonia excretion of yellow-spotted grunt Plectorhynchus cinctus were determined. The results showed that the oxygen consumption of P. cinctus increased with the increase of stocking density, the relationship between oxygen consumption rate and stocking density can be expressed by Y = 8. 1304X^-1.0512 （R^2 = 0. 9879）. Ammonia excretion of P. cinctus showed the trend of hyperbola with stocking density increasing, relationship between ammonia excretion and stocking density can be expressed by Y = - 0. 0047X^2 ＋ 0. 0542X ＋ 0. 0776 （ R^2 = 0. 5806 ）. Oxygen consumption and ammonia excretion of P. cinctus decreased as its weight increasing. Relationship between body weight and oxygen consumption, ammonia excretion can be expressed by Y = 2. 163X^-0. 8495 （ R^2 = 0. 9273 ） and Y = 0. 2394X^- 1.0344 （ R^2 = 0. 7794）, respectively. Average oxygen consumption and ammonia excretion in day time were lower than that at night, oxygen consumption in valley bottom value being 89. 19% of that of peak value and ammonia excretion in valley bottom value being only 22. 01% of that of peak value. Routine oxygen consumption was 1.19 - 1.39 times higher than basal oxygen consumption, and routine ammonia excretion was 1.23 - 1.96 times higher than basal ammonia excretion.