东海外海绿鳍马面鲀摄食习性的研究

1.东海外海的绿鳍马面鲀是一种主食浮游甲壳类,兼食软体动物和珊瑚的杂食性鱼类。2.1—6月绿鳍马面鲀摄食强度有两次高峰,分别出现在2—3月和5月。4月摄食强度最低,这可能和产卵习性有关。产卵前和产卵后均大量摄食,而在产卵盛期则少食或不食。3.绿鳍马面鲀的摄食强度以南部鱼群为最高,中部鱼群次之,北部鱼群最低。饵料种类组成也不一样,北部鱼群主要是摄食浮游甲壳类,而南部和中部鱼群除摄食浮游甲壳类外还摄食不少珊瑚、角贝和扁卷螺。4.绿鳍马面鲀一昼夜内,主要在下午到上半夜摄食,而在下半夜到上午则较少摄食和暂停摄食,明显地有昼夜垂直移动现象,产生此现象,不仅仅是由于追食饵料生物所引起,主要与其本身生活习性有关。

A STUDY ON THE FEEDING HABIT OF THE FILEFISH OF DONG HAI

The present paper deals with the freeding habit of the filefish Navodon septentrionalis (Günther) distributed in the outer region of Dong Hat.There have been examined and analysed 852 samples which were collected from the bottom trawling explorations during the period from January to June in 1974 to 1976. The results may be summarized as follows:1.Naxodon septentrionalis is a kind of omnivorous fish mainly feeding on the planktonic crustaceans as well as mollusca and corals.2.There are two peaks of feeding activity occurring in February to March and May respectively and the valley is in April, probably concerned with breeding activities.3.Thefeeding activity and the food composition of filefish varies in different areas, the southern shoal being the highest, the middle one the second, and the northern shoal the lowest.4.The feeding habit of Navodon septentrionalis also exhibits the phenomenon of diurnal vertical movement.