Fisheries ecology of Japanese anchovy in the Oyashio-associcted cold water area

2015 Fiscal Year Final Research Report

• Project/Area Number: 23248028
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: General fisheries
• Research Institution: The University of Tokyo
• Principal Investigator: Watanabe Yoshiro 東京大学, 大気海洋研究所, 教授 (90280958)
• Co-Investigator(Renkei-kenkyūsha): Takahashi Motomitsu 水産研究・教育機構, 西海区水産研究所, グループ長 (80526989) ; Takasuka Akinori 水産研究・教育機構, 中央水産研究所, グループ長 (00392902) ; Kubota Hiroshi 水産研究・教育機構, 研究開発コーディネーター (08071821)
• Research Collaborator: Mori Yasuo 北海道総合研究機構, 釧路水産権試験場, 主査 ; Goto Tomoaki 岩手県水産試験場, 上席専門研究員 ; Ebisawa Yoshitada 茨城県水産試験場, 部長 ; Katsukawa Yuu 東京大学, 大気海洋研究所, 特任研究員
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: カタクチイワシ / 親潮系冷水域 / 繁殖生態 / 初期生態 / 加入量変動

Outline of Final Research Achievements

The Pacific stock of Japanese anchovy increased in stock abundance in the 1990s and produced a substock spawns in the Oyashio-associated cold water area off northern Japan. This study investigated reproductive and early life ecology of the substock in the cold water area. The substock spawns in the warm surface water in a short summer period. Hatched larvae are to be transported southwestward to the coastal waters off northern Japan and recruited to the substock. The Pacific stock of anchovy is composed of the 3 substocks, the one spawned in the cold water area, the one immigrated from the Kuroshio waters, and the one from the Sea of Japan through the Tsugaru Strait. Fluctuation of the stock abundance is associated with the variation in composition of the 3 substocks.

Free Research Field

資源生態学