周期性饥饿-再投喂处理对豹纹鳃棘鲈幼鱼生长和饲料利用的影响

目的]探究周期性饥饿-再投喂处理对豹纹鳃棘鲈幼鱼生长和饲料利用的影响。方法]试验均设置对照组(持续投喂)、处理组S_1F_1(饥饿1 d、再投喂1 d)、S_1F_2(饥饿1 d、再投喂2 d)、S_2F_2(饥饿2 d、再投喂2 d),开展了2种规格豹纹鳃棘鲈幼鱼周期性饥饿-再投喂生长试验。结果]试验一S_1F_2、S_2F_2组和试验二S_1F_1、S_1F_2组试验结束时体质量与对照组均无显著差异(P0.05);试验一各处理组摄食率均高于对照组,其中S_2F_2组摄食率显著高于对照组,而饲料转化率显著低于对照组;S_1F_2组摄食率与对照组差异不显著,而饲料转化率显著高于对照组。试验二各处理组摄食率均显著高于对照组(P0.05),S_1F_2组饲料转化率与对照组无显著差异(P0.05),而S_1F_1组饲料转化率显著高于对照组(P0.05);试验结束时,各试验组粗脂肪含量均略低于对照组,水分含量略高于对照组,但均无明显差异(P0.05)。结论]试验一S_1F_2、S_2F_2组与试验二S_1F_1组、S_1F_2组均能够达到完全补偿生长,其补偿生长主要是通过提高摄食率和饲料转化率来实现的,在饥饿过程中豹纹鳃棘鲈幼鱼可能首先消耗脂肪作为能量来源。

Effects of the Cyclic Starvation-Refeeding Treatment on Growth and Feed Utilization of Plectropomus leopardus Juveniles

Objective] To study the effects of cyclic starvation-refeeding on the growth and feed utilization of Plectropomus leopardus juveniles.Method] Test groups S1 F1 (starvation for 1 day,then re-refeeding 1 day),S1 F2 (starvation for 1 day,then refeeding 2 days),S2 F2 (starvation for 2 days,then re-refeeding 2 days),control group(continuous feeding) were designed in the treatment.The growth experiment of cyclic starvationrefeeding of P.leopardus juveniles with different sizes was conducted.Result] The final body mass in S1F2 group and S2F2 group in experiment 1,S1 F1 group and S1 F2 group in experiment 2 had no significant difference with control group(CK).In experiment 1,the feeding rate of all test groups were higher than that of CK,feeding rate of S2F2 group was significantly higher than that of CK,but the feed conversion rate was significantly lower than that of CK;The feeding rate of S1 F2 group had no significant difference with that of CK,its feed conversion rate was significantly higher than that of CK(P ＜ 0.05).In experiment 2,the feeding rate of all test groups were significantly higher than that of CK,feed conversion rate in S1F2 group had no significant difference with CK.The feed conversion rate in S1F1 group was significantly higher than that of CK (P ＜0.05).At the end of the experiment,the crude fat content in all test groups were all slightly lower than that of CK,water content in all test groups were slightly higher than that of CK,but there was no significant difference (P ＞ 0.05).Conclusion] The completely compensatory growth of P.leopardus juveniles was achieved in S1F2 group and S2F2 group of experiment 1,S1F1 group and S1F2 group in experiment 2,which was mainly accomplished by increasing the feeding rate and feed conversion rate.The fat of P.leopardus juveniles might be firstly consumed as source of energy in the starvation process.