精包を付着させたツノナシオキアミの出現について〔英文〕

概要

論文の詳細を見る
Vertical distributions of Euphausia pacifica HANSEN were investigated in the vicinity of Otsuchi, the Sanriku coast of northeastern Japan, in the spring of 1981 and 1982. Many females with attached spermatophore and male with empty ejaculatory ducts were distributed below 100m along Todogasaki Section and Ozaki Section despite no remarkable thermocline. Females with sper-matophore were distributed below 15m depth throughout the whole day at Stn. A located near the mouth of Otsuchi Bay. Females with spermatophore occupied 45.0% of the total number of females collected from Stn. A. Minimum body length of males with at least one empty ejacala-tory duct and females with spermatophore was 14mm. Main breeding location of E. pacifica is the shallow waters near the coast and their copulation takes place in mid-water.
日本水産學會の論文