诸氏鲻虾虎鱼幼鱼饲料纤维素适宜含量的初步研究

Preliminary study on suitable cellulose content in formulated diet for juvenile Mugilogobius chulae

为探讨纤维素含量对诸氏鲻虾虎鱼幼鱼生长的影响,配制了6种不同纤维素含量的配合饲料,饲喂60日龄幼鱼8周,测定存活率(SR)、增重率(WG)、特定生长率(SGR)、摄食率(FR)、饲料系数(FCR)和肥满度(FUL),切片观察各组虾虎鱼的肠道,并测定鱼体基本组分(粗蛋白、粗脂肪、水分和灰分)。结果表明,幼鱼SR随纤维素含量的增加逐渐下降;WG和SGR先上升后下降;FR持续上升,但组间无显著差异;饲料纤维素含量超过2.98%时,幼鱼FUL持续下降;纤维素含量由14.52%增加到20.63%时,FCR极显著增大。同时纤维素含量影响虾虎鱼幼鱼肠道形态,并对鱼体粗蛋白、粗脂肪含量有显著影响,但对水分、灰分均无显著影响。诸氏鲻虾虎鱼幼鱼饲料最适纤维素含量为6.74%。

To assess the effects of cellulose level on growth and feed efficiency of juvenile goby （ Mugilogobius chulae ） and provide reference for exploitation of compound feed and the relevant standards development process, six purified diets with different cellulose levels, that is CK （ 0.29% ） , Ⅰ （ 0.85% ）, Ⅱ （ 2.98% ）,Ⅲ （ 7.23% ） , Ⅳ（ 14.52% ） and Ⅴ （ 20.63% ） were formulated. The protein and lipid contents were kept constant in all diets. At the end of 8 weeks growth experiment, Survival rate （ SR ） , Weight gain （ WG ）, Specific growth rate （ SGR ）, Feed conversion ratio （ FCR ）, Feeding rate （ FR ） and Fullness （ FUL ） were measured. Gobys＇ intestinal morphology and body compositions with different diertary cellulose levels were also measured. The results showed that juvenile fishes＇ SR decreased with the rising of cellulose levels. The SR of I （ 0.85% ） was significant different with other groups （ P〈0.05 ） . All groups＇ WG and SGR showed upgraded firstly and then decreased with the increase of dietary cellulose. When cellulose level increased to 7.23%, WG and SGR reached a maximum. Though the FR highly increased related to the increase of cellulose, there was no significant difference among groups. When dietary cellulose content increased to 20.63%, FCR significantly increased （ P〈0.05 ） . The FUL continuously decreased when dietary cellulose exceeded 2.98%. Meanwhile, dierary cellulose content had effects on the development of goby＇s intestinalmorphology. The whole body crude protein and lipid were also significantly influenced （ P〈0.05 ） by dietary cellulose, but mositure and ash were not influenced. The optimum cellulose content in diet for juvenile M. chulae is 6.74%.