The Oceanographic Research in the Southern Region of the Hawaiian Islands VII

• Main Authors: HIGASHI Masataka, SHIMADA Kiyoshi, YUWAKI Yasutaka, HENMI Tomio
• Format: Report
• Language: English
• Published: 鹿児島大学
• Subjects: 663; Subarctic
• Online Access: http://hdl.handle.net/10232/13299; https://ir.kagoshima-u.ac.jp/?action=repository_uri&item_id=10809; https://ir.kagoshima-u.ac.jp/?action=repository_action_common_download&item_id=10809&item_no=1&attribute_id=16&file_no=1

The oceanographic observations and the tuna fishing experiments in the southern region of theHawaiian Islands were carried out in May 1984. The results are summarized as follows:1) The mean values of temperature and salinity were about 26.0°C and 35.23% in the surfacewater, about 24.9°C and 35.34% in the subsurface saline water, and about 7.6°C and 34.14% in the subarctic intermediate water, respectively.2) Salinity of the surface water being higher than usual was remarkable. It apparently suggeststhat the anticlockwise meso-scale vortex existed.3) The highest catch of marlin was made on Nos. 1 and 5 hooks, and that of albacore on No. 3 hook.4) The actual depths of Nos. 1 and 5 hooks ranged between 95 m and 115 m, Nos. 2 and 4 hooksbetween 100 m and 145 m, and No. 3 hook between 120 m and 205 m.5) The good catches of marlin were estimated to be at the depths of 95 m-105 m or less andthat of albacore 180 m-205 m or more.6) The survey value was larger than the catenary value on No. 1 hook, while the former was smallerthan the latter on Nos. 2 and 3 hooks.7) Mean value of difference between the catenary and the survey values on each hook was-2.9 m on No. 1 hook, 20.6 m on No. 2 and 29.2 m on No. 3.