Some Notes on the Common Japanese Mackerel, Pneumatophorus Japonicus, in the southern waters of the East China Sea, in Summer : Preliminary report

Some investigations on the habitat of the common japanese mackerel were carried out by the "Kagoshima Maru", training ship of the Faculty of Fisheries, Kagoshima University, in the southern waters of the East China Sea in summer, both in 1964 and in 1965. The results are obtained as follows: 1) It was in the sea-front situated at the cross-section, lat. 29°-30' N and long. 124°-00' E and its vicinity that the confirmed catch of the common japanese mackerels including that of other fishes was carried out with the trawl-net in June and August, 1964. 2) The fork length of the common japanese mackerel caught there, was ranged in 280~350mm. 3) It was ascertained that, in the littoral water mass, water temperature 17~22°C and salinity 34.0~34.5‰ in summer, the habitats of some schools of the common japanese mackerels were to be found at the water near the bottom.1. 夏季に東支那海南部海域に棲息しているホンサバとその漁場環境について調査した。2. 北緯29°-30',東経124°周辺の水深70mの海域で6月と8月にトロール網で漁獲された魚類の中にホンサバが混獲された。3. ホンサバの体長範囲は280~350mmであった。4. ホンサバは夏季大陸沿岸性の水塊中で水温17~22°C,塩分34.0~34.5‰の範囲の底層近くに棲息しているものと推定される