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Effects of temperature and dietary protein on the growth performance and IGF-I mRNA expression of juvenile mirror carp (Cyprinus carpio)

文献类型: 外文期刊

作者: Huang, J. F. 1 ; Xu, Q. Y. 1 ; Chang, Y. M. 1 ;

作者机构: 1.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin 150070, Peoples R China

2.Shanghai Ocean Univ, Fisheries & Life Sci Coll, Shanghai, Peoples R China

关键词: dietary protein level;growth;mirror carp;mRNA;temperature;the insulin-like growth factors

期刊名称:AQUACULTURE NUTRITION ( 影响因子:3.497; 五年影响因子:3.78 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: Juvenile mirror carp were fed with five different diets containing 303, 322, 341, 361 and 379gkg(-1) protein and reared at three different water temperatures (18, 23 and 28 degrees C) for 60days. We investigated the insulin-like growth factor I (IGF-I) mRNA expression, growth performance and the relationship between IGF-I mRNA expression and the growth performance. The results indicated that the IGF-I mRNA expression, final body weight, specific growth rate (SGR) and feed efficiency (FE) were enhanced significantly with increasing dietary protein levels (P<0.05), whereas the protein efficiency ratio, hepatosomatic index (HSI) and viscerosomatic index (VSI) were decreased. Moreover, the IGF-I mRNA expression, final body weight and SGR were increased significantly with temperature, whereas the HSI and VSI indices were decreased significantly with temperature. Correlation analysis showed that the IGF-I mRNA expression levels in the brain and liver were positively related to the SGR and FE growth indices (P<0.01). Finally, the optimal protein requirements for fish growth in different seasons were determined based on the values of SGR and FE, that is 343-348gkg(-1) protein at 18 degrees C, 354-352gkg(-1) at 23 degrees C and 371-362gkg(-1) at 28 degrees C. In this way, we can adjust the dietary protein levels according to culture temperature to reduce any negative impacts on dietary costs and environmental pollution.

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