Stable isotope enrichment, dietary sources and trophic overlap between silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis)
Stable isotope enrichment, dietary sources and trophic overlap between silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis)
复制标题
DOI：
10.1016/j.aquaculture.2013.03.020
复制
发表时间：
2013-07
期刊：
影响因子：
4.5
通讯作者：
Kuanyi Li;Zenghong Xu;Zhengwen Liu;B. Gu
中科院分区：
文献类型：
--
作者：
Kuanyi Li;Zenghong Xu;Zhengwen Liu;B. Gu
银鲤（Hypophthalmichthys molitrix）和鳙鱼（Aristichthys nobilis）是重要的养殖鱼类，对其饵料来源的研究较多。在目前的工作中，稳定同位素分析（δ 13 C和δ 15 N）被用来评估的相对贡献的天然和人工饲料的生长和饮食重叠在这些鱼。在室内生长试验中，以鱼粉为唯一蛋白源的银和鳙鱼肌肉组织的δ 13 C和δ 15 N值显示出相同的同位素富集。在鱼塘进行的室外生长实验中，颗粒有机物（POM）和商业复合饲料（CD）的相对贡献，这两个鲤鱼的生长估计使用两个源的同位素混合模型。结果表明，鳙鱼比银需要更多的POM。这些鱼之间的饮食重叠的估计表明，银鲤和鳙鱼部分共享相同的饮食增长。这一发现与最近几项研究的结果一致，表明这些食虫动物的营养生态位并没有像以前建议的那样被隔离。
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 (δ13C and δ15N) 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 δ13C and δ15N 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.