2026-03-12T01:17:38Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02007796 2026-03-10T05:29:21Z 12:14:1716955731445

鮪延縄の敷設水深とその動態 Behavior of Tuna Long-Line Under the Sea Shimozaki, Yoshinori 下崎, 吉矩 シモザキ, ヨシノリ Shimozaki 下崎 シモザキ Yoshinori 吉矩 ヨシノリ Osawa, Yoichi 大澤, 要一 オオサワ, ヨウイチ Osawa 大澤 オオサワ Yoichi 要一 ヨウイチ 60372083 Niwa, Hirosato 丹羽, 洋智 ニワ, ヒロサト Niwa 丹羽 ニワ Hirosato 洋智 ヒロサト metadata only access The depth distributions of a main line of tuna long-lines laid under the sea were determined in a series of tuna long-line operations using self-registering depth meters and chemical tubes. main lines of five sorts of materials having different specific gravity and tenacity were used for respecfive 15-50 unit set for the experimental long-lining. The depth meters were set up at the joints of branch lines of a fixed set in every group of the mian line. The depth distributions measured with the depth meters accorded conparatively well with those calculated theoretically regarding the main line laid under the sea which forms a catenary curve when the current is slack or motionless. Hownver, the variance of the depth in one day of a laid long-line became remarkable according to the magnitude of velocity of the sea current and in inverse proprrtion to the specific gravity of the materials of those main lines. 水産工学研究所 National Research Institute of Fisheries Engineering 1988-03 jpn departmental bulletin paper https://fra.repo.nii.ac.jp/records/2007796 nrife_k_9_289 https://agriknowledge.affrc.go.jp/RN/2010393232 日本農学文献記事索引(agriknowledge) AN00332937 0388-9718 水産工学研究所研究報告 Bulletin of National Research Institute of Fisheries Engineering 9 13 289 301