期刊
AQUACULTURE RESEARCH
卷 40, 期 13, 页码 1532-1537出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2109.2009.02254.x
关键词
Nile tilapia; growth performance; protein regimes; feed utilization; proximate chemical analyses
类别
This study was conducted to evaluate the effect of various dietary protein regimes on growth performance, feed utilization and whole-body chemical composition of Nile tilapia, Oreochromis niloticus (L.). Twenty cages (1 m(3) each) were randomly allocated to a four-replicate experiment to represent five treatments (T1-T5) where fish were randomly stocked at a rate of 50 fish (1.5-2.2 g) per cage. Fish in T1-T5 fed on a 45% crude protein (CP) diet for the first 4 weeks. In T1, T2 or T3 fish fed on 45%, 35% or 25% CP diets for the last 8 weeks respectively. In T4 fish fed 35% CP diet for the second 4 weeks followed by 25% CP diet for the last 4 weeks and in T5 fish fed 25% CP diet for the second 4 weeks followed by 35% CP diet for the last 4 weeks. Diets were offered to satiation and provided manually twice a day in the morning and in the afternoon, 6 days a week. The optimum fish growth and feed utilization were obtained at T1, T2 and T4. Protein efficient ratio and apparent protein utilization were lower at T1 and T2 than those of T3-T5. On the other hand, no significant changes in energy utilization were observed among the different treatments. There were no major changes in the carcass composition except in ash content, which was higher in T3 and T5 only. This study recommended that the dietary protein regime is an important management in tilapia culture, and the protein level could be reduced from 45% to 35% then to 25% on increasing the fish size.
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