open access

https://hdl.handle.net/2115/53220

東部インド洋ジャワ島沖合における海況および気候変動とメバチマグロ漁獲量の時空間分布 [全文の要約]

英語

2013-06-28

Hokkaido University

https://www.lib.hokudai.ac.jp/dissertations/copy-guides/

Bigeye tuna (Thunnus obesus) is a commercially targeted species and represents one of the most valuable species of longline fisheries in the eastern Indian Ocean (EIO) off Java. It is a highly migratory species that is distributed between 40°N and 40°S in all 3 major oceans, except in the southwestern sector of the Atlantic. In the upper water column at night, bigeye tuna prefer a thermal range of 22-26°C. The main depth range of fishing for bigeye tuna in the Indian Ocean is 161–280 m, although they can inhabit the 0–100 m depth range during the night.The El Niño–Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) are two dominant modes of climate variations in the tropical Pacific and Indian Oceans with significant impacts to the ocean climate variability of several parts of the world. Therefore, for sustainable management of bigeye tuna resources in the EIO off Java, understanding the effects of ocean climate variability on catch distribution is essential. The ultimate goal of this study was to investigate how bigeye tuna catch distribution both spatially and temporally affected by oceanographic condition and ocean climate variability in the EIO off Java.

甲第11046号

博士(水産科学)

(主査) 教授 桜井 泰憲, 教授 齊藤 誠一, 准教授 平譯 享, 技術研究主幹 石川 洋一 （海洋研究開発機構）

水産科学院（海洋生物資源科学専攻）

博士論文

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