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(P<0.05),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。
Stable carbon and nitrogen isotope ratios（δ13C and δ15N） provide a predictable method to evaluate the contribution of food sources to bighead carp（Aristichthys nobilis）. We measured muscle δ13C and δ15N 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 the δ13C and δ15N 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 matter, and artificial feed were the food sources used in the different treatments, and their δ13C and δ15N 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.
出处
《中国水产科学》
CAS
CSCD
北大核心
2017年第2期278-283,共6页
Journal of Fishery Sciences of China
基金
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)
关键词
鳙
碳氮稳定同位素
施肥
投饲
Aristichthys nobilis
stable carbon and nitrogen isotope ratio
fertilization
feedstuff feeding
