Luo Gang, Zhuang Ping, Zhang Long-zhen, Zhang Tao, Liu Jian
East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai.
Ying Yong Sheng Tai Xue Bao. 2008 Jan;19(1):144-50.
This paper dealt with the diet composition and monthly variation in feeding habits of juvenile Acipenser sinensis accidentally caught along with other fish in Yangtze River estuary from May to September, 2004. The results showed that the juvenile A. sinensis mainly fed on demersal fish, polychaeta and amphipoda, as well as some small-sized benthic invertebrates including shrimp, crab and bivalve. The feeding rate and intensity were higher, and the feeding intensity varied monthly. The main food items also varied monthly, and changed from small-sized to relative large-sized species. The main diet composition included polychaeta and crab in May, fish and amphipoda in June, fish and polychaeta in July, empty stomach in August, and fish and shrimp in September. In the diet, the proportion of Platycephalidae, an important prey of juvenile A. sinensis in the past, was very low, only accounting for 1.81% of the total food by mass, while that of Gobiidae and Isopoda, which had not been recorded in the diet, was higher, accounting for 50.54% and 10:07% of the total, respectively.
本文研究了2004年5月至9月在长江河口意外捕获的中华鲟幼鱼的食物组成及其摄食习性的月度变化，这些幼鱼是与其他鱼类一同捕获的。结果表明，中华鲟幼鱼主要以底栖鱼类、多毛类和端足类为食，还包括一些小型底栖无脊椎动物，如虾、蟹和双壳类。其摄食率和摄食强度较高，且摄食强度存在月度变化。主要食物种类也随月份变化，从小型种类转变为相对大型的种类。主要食物组成在5月为多毛类和蟹，6月为鱼类和端足类，7月为鱼类和多毛类，8月为空胃，9月为鱼类和虾。在食物组成中，过去中华鲟幼鱼的重要猎物鲬科鱼类所占比例非常低，仅占食物总质量的1.81%，而过去未记录在其食物中的虾虎科鱼类和等足类动物所占比例较高，分别占总数的50.54%和10.07%。
