音響調査による薩南周辺海域におけるマイワシ産卵群の分布と環境〔英文〕

概要

論文の詳細を見る
Distribution patterns of the spawning population of the Japanese sardine Sardinops melanostictus off southern Kyushu were investigated by the acoustic method in relation to water temperature and the Kuroshio current in three successive winters from 1990 to 1992. Acoustic data were obtained by single-beam 50kHz echo sounders interfaced to digital integrators. Sardine distribution varied during January-March as time advanced. It was closely associated with both water temperature and spawning activity. Maturing sardine stayed on the inshore side of the Kuroshio front while spawning sardine occurred in the higher temperature offshore waters further than the Kuroshio front that appear to have acted as a barrier to distribution previously. The fish abundance in the area of sardine concentration decreased markedly over the 3 years.
日本水産學會の論文