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Stable isotope enrichment, dietary sources and trophic overlap between silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis)

文献类型： 外文期刊

作者： Li, Kuanyi 1 ; Xu, Zenghong 2 ; Liu, Zhengwen 1 ; Gu, Binhe 3 ;

作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China

2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Minist Agr, Key Lab Genet Breeding & Aquaculture Biol Freshwa, Wuxi 214081, Peoples R China

3.Minist Educ, Key Lab Lake Poyang Environm & Resource Utilizat, Nanchang 330029, Peoples R China

4.Sch Environm & Chem Engn, Nanchang 330029, Peoples R China

关键词： Bighead carp;Composite diet;Dietary overlap;Particulate organic matter;Silver carp;Stable isotope analysis

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： Silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis) are important cultivated fish and their dietary sources have been subject to many studies. In the present work, stable isotope analysis (delta C-13 and delta N-15) was used to assess the relative contributions of natural and artificial diets to the growth and dietary overlap in these fish. In an indoor growth experiment, the delta C-13 and delta N-15 values of muscle tissue of silver carp and bighead carp fed a fish meal as the sole protein source revealed identical isotope enrichment. In an outdoor growth experiment conducted in fishponds, the relative contribution of particulate organic matter (POM) and a commercial composite diet (CD) to the growth of both carps was estimated using a two-source isotope mixing model. Results revealed that bighead carp used more POM than silver carp for their growth. Estimates of dietary overlap between these fish suggest that silver carp and bighead carp partially shared the same diets for growth. This finding is consistent with the results of several recent studies, demonstrating that the trophic niche of these planktivores was not segregated, as was previously suggested

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