摘要
研究在(27.0±1)℃条件下,奥尼罗非鱼(Oreochromis niloticus×O.aureus)幼鱼[初始体重为(2.49±0.31)g]短暂饥饿处理后再投喂的补偿生长。结果显示:在恢复生长时期,饥饿3、6、9和12d处理组的特定增长率和摄食率显著高于对照组(P<0.05);各处理组的饲料转化率与对照组差异不显著(P>0.05);胃蛋白酶、胰蛋白酶和脂肪酶的活力变化趋势相同,均随先饥饿再饱食的顺序先下降后上升,而淀粉酶活力变化趋势不明显;恢复投喂后,各组奥尼罗非鱼幼鱼的消化酶活性均恢复到对照组水平。表明饥饿3d组的奥尼罗非鱼幼鱼在恢复生长中具有超补偿能力,饥饿6d组幼鱼具有完全补偿能力,饥饿9和12d组幼鱼具有部分补偿能力。奥尼罗非鱼幼鱼短暂饥饿后出现的补偿生长效应主要通过增加食欲、提高摄食率实现。
The compensatory growth was observed by refeeding hybrid tilapia ( Oreochromis niloticus × O. aureus ) juveniles with mean initial body weight (2.49 ± 0.31) g; after a short period of starvation, at (27.0 ± 1) ℃. The results showed that over the period of growth recovery, the specific growth rates and feeding rates for those groups starved for 3, 6, 9 and 12 d respectively were significantly higher than those of control group ( P〈 0.05); there was no significant difference between the feed conversion rates of test groups and that of control ( P 〉 0.05); trends of activities of pepsin, tryptase and lipase were the same, initially decreasing and then increasing from starvation to satiation and the change in amylase activity was not striking; after recovering the feed, and the activities of digestive enzyme for test groups were increased, grossly identical to that of the control. It indicated that the subject starved for 3d was of over-compensatory capability across the growth recovery; those juveniles that were starved for 6d were of full compensatory ability, whereas those starved for 9 and 12d had only partial compensation for growth. The compensatory growth occurring after short-term starvation for hybrid tilapia juveniles mainly resulted from hyperphagia and increase of feeding rate.
出处
《广东海洋大学学报》
CAS
2010年第1期7-12,共6页
Journal of Guangdong Ocean University
基金
国家科技支撑计划(2008BADB9B01-3)
广东省教育部产学研结合项目(2008B090500088)
关键词
奥尼罗非鱼
幼鱼
饥饿
补偿生长
消化酶
hybrid tilapia (Oreochromis niloticus ×O.aureus)
juvenile
starvation
compensatory growth
digestive enzyme