期刊
FISHERIES SCIENCE
卷 75, 期 3, 页码 577-584出版社
SPRINGER TOKYO
DOI: 10.1007/s12562-009-0075-3
关键词
Diel vertical distribution; Larvae; Ontogenetic; The East China sea; Trachurus japonicus
类别
Larvae of jack mackerel Trachurus japonicus were sampled in seven depth layers (0-10 m, 10-20 m, 20-30 m, 30-40 m, 40-50 m, 50-70 m, and 70-100 m), with a closing-type frame net, on 26th-27th February, 2003, at Sta. V (27A degrees 50'N, 126A degrees 00'E) continental shelf edge in the southern part of East China Sea, to examine their vertical distribution. Most of the larvae (> 90%) occurred in the upper 50 m layer during both day and night. In the daytime, larvae of length from 3.0 mm to 4.5 mm were most abundant in the 10-20 m layer, those from 5.0 to 6.0 mm were most abundant in the 20-30 m layer, those from 6.0 to 8.0 mm occurred at greater depth, in the 30-40 m layer, and those more than 9.0 mm were found in the 0-10 m layer and performed ontogenetic vertical migrations. Larvae from 6 mm to 8 mm length performed diurnal vertical migration, for the percentage (16.7%) of larval number in the 0-20 m layer in the daytime increased to 42.1% at night and the percentage (78.1%) in the 20-50 m layer in the daytime decreased to 49.0% at night.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据