不同投喂模式下新吉富罗非鱼的补偿生长

Compensatory Growth of NEW GIFT(Oreochromis niloticus) under Various Feeding Regimes

在23.7℃～31.2℃条件下,将初始体重约为31.65g的新吉富罗非鱼(NEW GIFT,Oreochromis niloticus)饲养在12只直径1.0m的圆形不锈钢桶中,每桶20尾,采用4种不同投喂模式饲喂47d:A组(每天投喂,对照组)、B组(隔天投喂)、C组(隔1d投喂3d)和D组(隔1d投喂5d),研究了不同投喂模式对新吉富罗非鱼补偿生长的影响。结果显示:D组的增重率显著高于其它各组(包括对照组)(P<0.05),达到164.76%;B、C、D组的摄食率和特定生长率显著高于对照组(P<0.05),B组和D组的饲料效率显著高于对照组(P<0.05),都达到70%以上。B组和C组新吉富罗非鱼仅有部分补偿生长能力,而D组显示了超补偿生长效应。这种补偿生长效应主要通过饥饿后食欲增强,摄食量增加实现,但饲料效率的提高对补偿生长也有一定的贡献。研究结果为罗非鱼的科学养殖及其补偿生长效应在生产中的应用具有一定的指导意义。

A feeding trail was conducted to investigate compensatory growth in NEW GIFT tilapia （Oreochromis nilotic us ） fed by vari- ous patterns. The NEW GIFT with initial body weight of about 31.65 g were reared in 12 stainless steel tanks with a diameter of 1.0 m at a rate of 20 individuals per tank and fed daily （ group A, control group ）, once every other day （group B ）, fed for three days every 1 day starvation （ group C ） and fed for five days every 1 day starvation （ group D ） for 47days with triplication at water temperature of 23.7 ℃ -31.2 ℃. The growth rate were shown to be significantly higher in group D than other group （including the control group ） （P〈0.05）, reached164.76%;The food intake and specific growth rate were shown to be significantly higher in group B, group C and group D than those in the control group （P〈0.05）;There was significantly higher feed efficiency in group B and group D than that in control group （P〈0.05）,all reached above 70%. It indicated that over-compensatory growth ability was observed in group D, whereas only partial compensation growth was found in group B and group C. The compensatory growth in the NEW GIFT after starvation was primarily attributed in enhancing appetite and food intake, but the improvement of feed efficiency has certain contribution to the com- pensatory growth. The results have certain guiding significance for scientific breeding and the production oftilapia.