闽南粤东近海金色小沙丁鱼的食性

ON THE FEEDING HABIT OF SARDINELLA AURITA VAL IN SOUTH FUJIAN-EAST GUANGDONG COASTAL WATERS

金色小沙丁鱼的食性研究国外曾有报道,国内未见到周年性的较系统的研究。为此,本文对闽南粤东近海金色小沙丁鱼的胃含物进行了周年的分析,力图探讨其食性问题。一、材料与方法本文所用标本系1979年12月至1980年11月逐月从厦门沙坡尾水产购销站灯光围网和底拖网的渔获物中采集。幼鱼标本分别于1980年5、7月和9月在广东南澳和福建东山搜集。生物学测定按中国农林科学院(1974年9月)颁发的《海洋渔业资源调查的几项技术标准》进行。此外,对部分标本的摄食消化器官也做了观测。胃含物的分析除采用个数法、出现频率等方法外,还采用了“平均体积指数”法。

Sardinella aurita Val captured in South Fujian—East Guangdong coastal waters is a warm pelagic fish feeding mostly on plankton.The primary food items of the juvenile ate diatoms,small copepods and of the adults are planktonic crustacea.The feeding intensity of the adults is lower than that of the juvenile and varies remarkably with seasons,being highest in winter and lowest in autumn.The seasonal changes of food composition is not very sig nificant:copepods mainly in summer,autumn and winter,Gastrosaccus(Mysidacea)in spring.The feeding habits between the two sexes seems to be that the feeding intensity of the females is greater than that of the males in spriog and summer and conversely in autumn and winter.The Mean Bulk Index method has been used and discussed and the results shows that this method is suitable for the study of feeding of Sardinella aurita.