亚东鲑幼鱼饥饿后的补偿生长试验及其补偿机制探讨  

Compensatory Growth and its Mechanism of Young Salmon trutta after Food Deprivation

作　　者：王万良 王建银[2] 陈美群 曾本和 张驰 周建设 WANG Wanliang;WANG Jianyin;CHEN Meiqun;ZENG Benhe;ZHANG Chi;ZHOU Jianshe(Institute of Aquatic Science, Tibet Agriculture and Animal Husbandry Academy of Sciences, Lhasa 850000, China;Tibet Academy of Agriculture and Animal Husbandry, Lhasa 850000, China)

机构地区：[1]西藏自治区农牧科学院水产科学研究所,拉萨850000 [2]西藏自治区农牧科学院,拉萨850000

出　　处：《经济动物学报》2017年第4期211-214,共4页Journal of Economic Animal

基　　金：西藏自治区自然科学基金项目(2016ZR-NK-15);农业部公益性行业专项(201403012)

摘　　要：为研究亚东鲑幼鱼阶段的存活率、增重率、特定生长率、摄食率及食物转化率的变化,探讨其补偿机制。控制水温为14~16℃,溶氧6.5~8.5 mg/L,在长方形平列槽中对平均体质量(5.48±0.46)g的亚东鲑幼鱼进行饥饿0,7,14,21,28 d,之后进行再投喂试验,试验为期49 d。结果表明:鱼苗存活率为98.5%;增重率Ⅰ组显著高于其他各组(P<0.05);特定生长率Ⅱ组和Ⅲ组显著高于其他各组(P<0.05),Ⅰ组、Ⅳ组和Ⅴ组差异不显著(P<0.05);摄食率Ⅰ组、Ⅱ组和Ⅴ组差异不显著(P>0.05),但显著高于Ⅲ组和Ⅳ组(P<0.05);饲料转化率Ⅲ组最高,为53.67%±1.29%,显著高于其他各组(P<0.05)。由此可知,饥饿7 d组、14 d组和21 d组体质量均低于对照组,属于部分补偿生长类型,幼鱼饥饿后,通过提高摄食率和降低标准代谢共同来实现部分补偿生长的能力;而饥饿Ⅴ组,即28 d组体质量出现负增长,属于不能补偿生长类型,可能原因是饥饿时间过长,恢复投喂时间过短所致。In order to study the survival rate, weight gain, specific growth rate, feeding rate and food conversion rate of young Salmon trutta , and discuss the compensation mechanism, the young Salmon truttathe with average body weight of （5.48±0.46） g were starved for 7, 14, 21 and 28 days and refed in a rectangular horizontal tank with water temperature of 14-16℃ and dissolved oxygen of 6.5-8.5 mg/L. The experiment lasted for 49 d The results showed that, and the survival rate of fry was 98.5 %, the rate of weight gain of group Ⅰ was significantly higher than that of other groups （P〈 0.05） ; the specific growth rate of group Ⅱ and group Ⅲ was significantly higher than that of other groups （P〈0.05）, but there was no significant difference between group Ⅰ, group Ⅳ and group Ⅴ （P〉0.05） ; the food intake rate was not different significantly between group Ⅰ, group Ⅱ and group Ⅴ （P〉0.05）, but significantly higher than that of group Ⅲ and group 4 （P〈0.05） ; the feed con- version rate was the highest in group Ⅲ, and was 53.67%＋1.29%, which was significantly higher than that in other groups （P〈0.05）. These results declared the body weight of the starved 7 d, 14 d, and the 21 d group were lower than that of the control group, which belonged to the partly compensatory growth type. The ability to partially compensate for growth was achieved by increasing feeding rates and decreasing standard metabolism when juveniles were starved. However, the body weight in the starved 28 d group showed a negative growth, which was not compensated by the growth type. The reason might be that the starvation time was too long, and the recovery time was too short.

关 键 词：亚东鲑 幼鱼 饥饿 补偿生长 

分 类 号：S965.232[农业科学—水产养殖]