Food preference of paddlefish, Polyodon spathula (Walbaum, 1792), in polyculture with bighead carp Aristichthys nobilis (Richardson, 1845) in non-fed ponds

文献类型： 外文期刊

第一作者： Zhu, Y. J.

作者： Zhu, Y. J.;Li, X. M.;Yang, D. G.

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期刊名称：JOURNAL OF APPLIED ICHTHYOLOGY （ 影响因子：0.892； 五年影响因子：0.956 ）

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收录情况： SCI

摘要： The food preferences of paddlefish (Polyodon spathula) in polyculture with bighead carp (Aristichthys nobilis) are unknown. Three consecutive analyses of gastrointestinal contents of paddlefish and bighead carp were conducted at 3d, 11d and 19d after introduction into the non-fed ponds. The objectives of this study were to test for competitive interactions between bighead carp and paddlefish, and to document their preferred prey when the two species have a limited food resource. The results showed that paddlefish and bighead carp are basically competitive in their diets. When they were cultured in one pond at the same density, paddlefish fed more quickly and efficiently, depleting the food resources for bighead carp; however, bighead carp were able to switch and trap small food items with the decrease in available food resources. Moreover, larger zooplankton abundance declined in ponds after fish were introduced.

分类号： S9

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