摘要
在水温２８℃的条件下，不限量投喂颗粒饵料，测定了台湾红罗非鱼（体重２２．４２～２６．９３ｇ）在淡水和盐度为７、１４、２１、２８和３５％时的能量收支。结果表明：盐度对台湾红罗非鱼的特定生长率、转化效率和最大摄食率均有显著影响，盐度为１４‰时，特定生长率和转化效率均达到最高水平，分别为１．４３％和５１．８８％，此时，摄食率也达到最大，每天为体重的２．７４％，盐度对吸收效率无显著影响，对干物质、蛋白质和能量的吸收效率的平均值分别为６２．９８％、８８．４２％和７１．１４％。盐度对同化效率无显著影响，平均值为６４．３１％；不同盐度下生长能占同化能的比例有显著差异，盐度为３５‰时生长能占同化能的比例最高为３７．０５％，而盐度为２１‰时最低，为２０．１７％。
Studies of the energy budget of the Taiwan Residents red tilapia hybrid ( Oreochromis niloticus×O. mossambicus ) (weighed 22.46～26.93g) were conducted on at different salinity levels:7,14,21,28 and 35 ‰ kept at 28℃ in fresh water. The experimental result showed that SGR , conversion efficiency and food consumption were affected by salinity significantly. The maximum SGR ( wet weight) , the food consumption rate and assimilation rate were 1.43% B. W./d., 2. 74% B. W. /d. and 51. 88% respectively when the salinity was 14‰. Salinity had no significant effects on the absorption efficiency. The mean absorption efficiency of dry staff, protein and energy were 62. 98%, 88. 42% and 71. 14% respectively. The energy allocation was affected by salinity by the way of food consumption and metabolism. The assimilation rate was not obviously affected by salinity, the mean of which was 64.31%; the propotion of growth energy to the assimilation energy was significantly different at different salinity levels. The maximum propotion was 37.05% when salinity was 35‰ while the minimum propotion was 20.17% when salinity was 21‰.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1999年第3期256-259,共4页
Journal of Huazhong Agricultural University
基金
国家自然科学基金
