作 者：
郭爱;陈峰;朱文斌;王忠明;蒋日进;周永东
关键词：
东、黄海;凤鲚;发育阶段;食性;%IRI
摘 要：
根据东海区(26°-35°00′N,120°00′-126°30′E)大面调查渔获物的凤鲚样本,对东、黄海凤鲚不同发育阶段的食物组成、摄食强度、食物生态位宽度和食物团单个饵料的重量差异进行了研究,并对不同体长组的凤鲚进行了聚类分析。研究结果表明:(1)凤鲚不同阶段的食物组成随着发育的变化有所不同,根据%IRI分析,桡足类为各个发育阶段的最重要的食物,糠虾类、磷虾类为次重要的类群,随着体长的增加小型鱼类在食物组成的%IRI比重越来越高。(2)凤鲚有两个摄食强度的高峰:幼体组70~100 mm和成体组191~250 mm,平均胃饱满系数均超过10‰。空胃率和体长呈现出负相关关系,随着体长的增加,空胃率不断下降。(3)食物团中单个饵料的平均重量随着凤鲚体长的增加而增加,两者呈现正相关关系。体长70~160 mm阶段,单个饵料的平均重量都小于10 mg,体长161~250 mm阶段,单个饵料的平均重量均大于30 mg。(4)聚类分析表明可将的凤鲚6个体长组可以分为3组:70~100 mm、101~130 mm、131~250 mm。体长70~100 mm的凤鲚主要以桡足类和幼体类为食,体长101~130 mm的凤鲚主要摄食桡足类、糠虾类和磷虾类,体长131~250 mm的凤鲚主要摄食桡足类、糠虾类和鱼类。(5)凤鲚不同发育阶段食物生态位宽度也存在差异,体长101~130 mm饵料多样性指数最高为2.37,体长70~100 mm饵料多样性指数最低为0.96,体长131~250 mm之间各体长组饵料多样性指数相差不大。
译 名：
The Food Variation in Different Ontogenetic Stages of Coilia mystus in the East China Sea and Southern Yellow Sea
作 者：
GUO Ai;CHEN Feng;ZHU Wen-bin;Marine Fisheries Institute of Zhejiang Province, Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds, Ministry of Agriculture,Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province;College of Marine Science and Technology, Shanghai Ocean University;The Second Institute of Oceanography,SOA;
关键词：
East China Sea and Yellow Sea;;Coilia mystus;;development stage;;feeding;;%IRI
摘 要：
Based on samples from the voyages in the East China Sea and southern Yellow Sea(26°00′-35°00′ N and 120°00′-126°30′ E), the food composition, feeding intensity, niche breadth of the food, and weight variation of single species in the food mass of Coilia mystus in different ontogenetic stages were analyzed, and C. mystus in different size classes were also analyzed by clustering. The results showed that the food composi-tion of C. mystus varied in different ontogenetic stages. According to the index of relative importance(IRI) of the food components, copepods were the most important in the food spectrum in the whole ontogeny, and then were mysids and euphausids. The IRI percentage of small fishes in the food composition increased with the increase of the body length. The feeding intensity had two peaks in the juvenile group(body length 70-100 mm)and the adult group(191-250 mm), with mean stomach fullness index higher than 10‰. There was a negative correlation between the percentage of empty stomachs and the body length, i.e., the percentage of empty stomachs decreased with the increase of the body length. In the food mass, the mean weight of single ingredient increased with the increase of the body length, showing a positive correlation. All the mean weights of single ingredient were lower than 10 mg in the stage of body length 70-160 mm, and higher than 30 mg in the stage of body length 161-250 mm. The results of clustering analysis showed that C. mystus in six size classes could be divided into 3 groups, body length 70-100 mm, 101-130 mm, and 131-250 mm, with different food composition. C. mystus mainly fed on copepods and larvae in body length 70-100 mm, copepods, mysids and euphausids in body length 101-130 mm, and copepods, mysids and fishes in body length 131-250 mm. The niche breadth of the food also varied in different ontogenetic stages of C. mystus. The diversity index of the food was the lowest in body length 70-100 mm and the highest in body length 101-130 mm, and didn't vary much in body length of 131-250 mm.
