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稳定同位素技术分析不同养殖方式下鳙饵料的贡献率
引用本文:李学梅,朱永久,王旭歌,许德高,杨德国.稳定同位素技术分析不同养殖方式下鳙饵料的贡献率[J].中国水产科学,2017,24(2):278-283.
作者姓名:李学梅  朱永久  王旭歌  许德高  杨德国
作者单位:1. 中国水产科学研究院长江水产研究所,农业部淡水生物多样性保护重点实验室,湖北武汉 430223;2. 中国水产科学研究院长江水产研究所,农业部淡水生物多样性保护重点实验室,湖北武汉 430223;华中农业大学水产学院,湖北武汉 430070
基金项目:国家自然科学基金项目(31502142),"十二五"国家科技支撑计划项目(2012BAD25B05)
摘    要:应用碳氮稳定同位素技术分析了不同养殖方式(A组:施肥;B组:施肥+1/2投饲;C组:施肥+投饲;D组:投饲)围隔中鳙(Aristichthys nobilis)肌肉碳氮稳定同位素变化情况,及其可能摄食饵料的贡献率。结果表明,A组鳙肌肉的δ13C和δ15N值分别为(–23.8±0.1)‰和(10.8±0.4)‰,显著高于B组、C组和D组的值(P0.05),后三者之间值没有显著差异。围隔中的食物源有浮游动物、颗粒有机物和饲料,它们的δ13C和δ15N值均低于消费者鳙的同位素值。3种食物在不同养殖方式下的贡献率不同,浮游动物是A组鳙的主要食物来源,平均贡献率为(65.6±3.2)%,饲料是另3个组鳙的主要食物来源,其中B组饲料的贡献率相对较大,达82.1%。说明投饲鳙后,鳙对饲料能够较好地吸收利用,但在池塘中同时培育天然饵料能有效提高饲料的贡献率,减少投饲量,降低残饵的污染。本研究旨为实践养殖中合理投饲鳙的管理技术提供理论依据。

关 键 词:  碳氮稳定同位素  施肥  投饲
修稿时间:2017/3/7 0:00:00

Using a stable isotope ratio to evaluate the contribution of food to bighead carp (Aristichthys nobilis) subjected to different breeding methods
LI Xuemei,ZHU Yongjiu,WANG Xuge,XU Degao,YANG Deguo.Using a stable isotope ratio to evaluate the contribution of food to bighead carp (Aristichthys nobilis) subjected to different breeding methods[J].Journal of Fishery Sciences of China,2017,24(2):278-283.
Authors:LI Xuemei  ZHU Yongjiu  WANG Xuge  XU Degao  YANG Deguo
Institution:1. Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture;Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China;2. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
Abstract:Stable carbon and nitrogen isotope ratios (δ13C andδ15N) provide a predictable method to evaluate the contribution of food sources to bighead carp (Aristichthys nobilis). We measured muscleδ13C andδ15N of bighead carp in four treatments, such as fertilization (group A), fertilization + 1/2 feeding (group B), fertilization feeding (group C), and feeding (group D) to analyze variations in the stable isotope ratios and the contribution rates of different food sources. The results showed that theδ13C andδ15N values in group A tended to be higher than those in the other groups (?23.8±0.1)‰ and (10.8±0.4)‰, respectively,P<0.05]. Zooplankton, particulate organic mat-ter, and artificial feed were the food sources used in the different treatments, and theirδ13C andδ15N values were lower than those of bighead carp. Zooplankton was a major food source for bighead carp in group A, with a mean contribution rate of (65.6±3.2)%, whereas artificial feed was the main food source in the other three groups, of which the contribution rate in group B was relatively higher (82.1%). These results suggest that artificial feed was absorbed well by bighead carp. However, fertilizing the cultured plankton effectively improved the contribution by artificial feed, decreased the amount of feed, and reduced the pollution caused by residual feed. The present study provides a theoretical basis to invest and culture bighead carp.
Keywords:Aristichthys nobilis  stable carbon and nitrogen isotope ratio  fertilization  feedstuff feeding
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