海州湾小黄鱼幼鱼和黄鲫幼鱼的食物竞争  

Food competition between juvenile Pseudosciaena polyactis and juvenile Setipinna taty in the Haizhou Bay

作　　者：郭斌[1,2] 张波[1] 戴芳群[1] 金显仕[1] 

机构地区：[1]农业部海洋渔业资源可持续利用重点开放实验室中国水产科学研究院黄海水产研究所,青岛266071 [2]上海海洋大学海洋科学学院,201306

出　　处：《渔业科学进展》2011年第1期8-15,共8页Progress in Fishery Sciences

基　　金：国家重点基础研究规划项目(2006CB400608);国家自然科学基金项目(41076110;40906086);山东省泰山学者专项基金共同资助

摘　　要：根据2008年7~8月在黄海海州湾海域进行的定点底拖网调查,应用胃含物分析法、多元统计分析法、饵料重叠系数法等,对小黄鱼Pseudosciaena polyactis幼鱼和黄鲫Setipinna taty幼鱼的食物竞争关系进行研究。结果表明,小黄鱼幼鱼和黄鲫幼鱼的营养级相同,均为3.33级。但是它们的食物组成相似性(0.06~0.20)和饵料重叠系数(0.03~0.38)并不高,均小于0.6,而两种鱼类幼鱼种内的食物组成相似性和饵料重叠系数则较高。从饵料组成来看,甲壳类中的真刺唇角水蚤La-bidocera euchaeta和长额刺糠虾Acanthomysis longirostris在两种鱼类幼鱼体长/叉长较小阶段存在一定程度上的重叠,之后随着个体的生长发育,摄食逐渐产生分化。从本研究的结果判断,小黄鱼幼鱼和黄鲫幼鱼之间可能存在较弱的种间资源利用性食物竞争,而两种鱼类幼鱼各自则可能存在较大的种内资源利用性食物竞争。Pseudosciaena polyactis and Setipinna taty are two kinds of important commercial fish species in the northern East China Sea and the Bohai Sea,and they play an important role in the marine ecosystems.In our study,the dietary overlap and food competition between these two juvenile fish species at their common length of 35~69mm were examined by applying the multivariate statistical technique,the Schoener′s similarity index,and the Pianka index,based on the total of 547 samples collected from seasonal bottom trawl surveys in the Haizhou Bay of the Yellow Sea during July^August,2008.The results indicated that these two juvenile fish species had the same trophic level of 3.33.Both the Schoener′s similarity index（0.06~0.20） and dietary overlap coefficient（0.03~0.38） between juveniles of the two fish species were lower than 0.6.In contrast,their intra-specific values of food composition similarity and dietary overlap coefficient were relatively high.At the species level,crustaceans including Labidocera euchaeta and Acanthomysis longirostris were the common preys in the developing prophase of the two fish species.Then different changes in diet appeared as the two juvenile fish grew.We conclude that there is low inter-specific competition between juveniles of these two fish species and high intra-specific competition within each species.

关 键 词：小黄鱼 黄鲫 饵料重叠 食物竞争 

分 类 号：S932.4[农业科学—渔业资源]