千年笛鲷幼鱼耗氧率的研究

Study on the oxygen consumption of fry of seba's snapper Lutjanus sebae

千年笛鲷幼鱼的耗氧量随幼鱼体重的增加而增加,耗氧量与体重的关系式为Y=0．756+0．513X。千年笛鲷幼鱼的耗氧率随幼鱼体重的增加而下降,耗氧率与体重的关系式为Y=1246．430X^(-0.036)。幼鱼在遮光条件下的耗氧率比在自然光照条件下要低15．362%～31．675%。在低盐度水环境下幼鱼的耗氧率较高,随着盐度的增加,其耗氧率降低。随着饥饿程度的加深,千年笛鲷幼鱼的代谢水平呈梯度下降。在盐度20和28时,千年笛鲷幼鱼的窒息点分别为0．93和1．17 mg·L^(-1)。

The oxygen consumption [ mg·（ fish·h） ^-1 ] of fry of seba＇s snapper Litanies sebae in relation to body weight gives a straight line Y = 0. 756 ＋ 0. 513X, when the oxygen consumption [ mg·（ kg·h） ^-1 ] is plotted against the body weight. The oxygen consumption [ mg·（ kg·h） ^-1 ] of fry of this species decreases as the body weight of fry growing from 0. 611 g to 22. 821 g. It can be expressed by the regression line of Y = 1246. 430X^-0.036. Oxygen consumption of the fry under dark condition is 15. 362% - 31. 675% lower than that in light exposure. In the water with low salinity the fry takes up more oxygen, but it uptakes less as the salinity decreased. With the aggravation of starvation, the oxygen consumption of fry of L. sebae decreases on an echelon way. The suffocation point of fry of L. sebae are 0. 93 and 1.17 mg·L^-1 respectively under the condition of salinity of 20 and 28.