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Relation between catches of longtail Tuna (Thunnus tonggol) and water temperature off Futaoi Island, Shimonoseki City, Yamaguchi Prefecture in the Sea of Japan based on catch data during the period 1995-2000 10416464 Mohri, Masahiko 毛利, 雅彦 モウリ, マサヒコ Mohri 毛利 モウリ Masahiko 雅彦 マサヒコ Fukada, Koichi 深田, 耕一 フカダ, コウイチ Fukada 深田 フカダ Koichi 耕一 コウイチ 10371915 Yamada, Harumi 山田, 陽巳 ヤマダ, ハルミ Yamada 山田 ヤマダ Harumi 陽巳 ハルミ Kamano, Tadashi 鎌野, 忠 カマノ, タダシ Kamano 鎌野 カマノ Tadashi 忠 タダシ open access tuna; water temperature; set net; trawl net In recent years there has been insufficient study of longtail tuna, despite large harvests being recorded in the Sea of Japan. In the present study, therefore, we examine the relationship between longtail tuna catches and water temperature in the Sea ofJapan off the coast of Yamaguchi Prefecture.　The results are as follows : I. The fishing season is from June to October. 2. We found from the study of juveniles caught by surface-water trawlling and oceanographic observation that : -Fork length ranged from 125 mm to 166 mm at the survey point. -Water ternperature was approximately 24℃ at the depth of the sampling position of longtail tuna juveniles. 3. Horizontal distribution of sea surface water temperature in 1996 was analyzed as follows using the NOAA satellite : -In July and September, adult longtail tuna were caught in abundance off the Futaoi Island, and the sea surface water temperature was as high as 24℃ around the set net position. -Temperature in August was above 24℃. -Temperature in October was below 24℃. 水産大学校 National Fisheries University 2009-11-30 eng departmental bulletin paper https://fra.repo.nii.ac.jp/records/2011927 fishu_k_58_59 AN00124678 0370-9361 水産大学校研究報告 Journal of National Fisheries University 58 1 5 59 63 https://fra.repo.nii.ac.jp/record/2011927/files/fishu_k_58_59.pdf application/pdf 224.1 KB 2024-10-11