湖泊科学2012，Vol.24Issue(5)：765-770,6.
太湖贡湖湾鲚(Coilia ectenes taihuensis Yen et Lin)食物组成的季节变化
Seasonal variations in the diets of Coilia ectenes taihuensis Yen et Lin in Gonghu Bay of Lake Taihu
摘要
Abstract
Coilia ectenes taihuensis Yen et Lin ( C. ectenes) is the dominant fish species in Lake Taihu, and the catch has been increasing with the eutrophication of Late Taihu. En this study, in order to investigate the seasonal diets variations of C. ectenes in Gonghu Bay of Lake Taihu, we sampled the fish by gill net and analyzed bimonthly the gut contents of C. ectenes from April to December, 2009. Meanwhile, selectivity for different food items was also analyzed for the purpose to study the food preference of the fish. The results showed that the food composition of C. ectenes varied from month to month. Zooplankton, fish larvae, shrimp and insects were found in the stomach contents of the fish, but sooplankton was the dominant food. Among the zooplankton species, Copepod was the main food in April with close mean percentages diet composition of Copepodite, Sinocalanus dorrii Brehm and Cyclops spp. In June, August and October, C. ectenes fed mainly on cladoceran with Moina spp. as the dominated mean percentage diet composition in June and Bosmina spp. in August and October, respectively. Small zooplankton composed the main percentage diet composition, such as Bosmino spp. and Moina spp. , in all sampling months. However,C. ectenes negatively selected Bosmina spp. for their food, but positively selected Moina spp. and other large-sized zooplankton species. But when Daphnia spp. and Leptodora kindti Focke were present in the sampling months, C. ectenes showed high selectivity for them. From this investigation,we can conclude that C. ectenes feed mainly on planktonic crustaceans, and showed high selectivity for large-sized zooplankton. Moreover, fish larvae, shrimp and insects may be their potential food for the fish when its total length is longer than 130 mm. Different food items varied largely in fish food composition among different seasons. Studying on the diet composition of C. ectenes can help us understand the seasonal effects of C. ectenes on zooplankton community structures better, and provide evidences and foundations for making rational plans of fisheries and lake management.关键词
太湖/贡湖湾/鲚/食物组成/季节变化Key words
Lake Taihu/ Gonghu Bay/ Coilia ectenes/ food composition/ seasonal variation引用本文复制引用
于谨磊,何虎,李宽意,陈非洲,刘正文..太湖贡湖湾鲚(Coilia ectenes taihuensis Yen et Lin)食物组成的季节变化[J].湖泊科学,2012,24(5):765-770,6.基金项目
国家自然科学基金项目(31070419,31170441)和国家重点基础研究发展计划“973”项目(2008CB418104)联合资助. （31070419,31170441）
