Elucidation of capture process and mechanism of purse seine tuna fishing by using ICT

2016 Fiscal Year Final Research Report

• Project/Area Number: 26450269
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Hokkaido University
• Principal Investigator: Takagi Tsutomu 北海道大学, 水産科学研究院, 教授 (80319657)
• Co-Investigator(Renkei-kenkyūsha): TORISAWA Shinsuke 近畿大学, 農学部, 講師 (80399097) ; MITSUNAGA Yasushi 近畿大学, 農学部, 准教授 (90319658) ; KAWABE Ryo 長崎大学, 環東シナ海環境資源研究センター, 教授 (80380830)
• Research Collaborator: KADOTA Minoru テンプル大学ジャパンキャンパス, 国際ビジネス学科, 准教授
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: マグロ類 / 旋網 / 行動解析 / 数値シミュレーション / ICT

Outline of Final Research Achievements

To assess the capture process during purse seine fishing of tuna species, the dynamic geometries of the purse seine fishing net under some operations were investigated by using a numerical simulation technique as well as by obtaining three-dimensional swimming paths of three bigeye tuna individuals during the purse seine fishing operation through dead-reckoning algorithms. The vectors of the swimming paths showed great variations in the vertical and horizontal directions. The hem of the purse seine net reached up to 200 m in depth, whereas the tuna individuals swam at depths shallower than 100 m and their swimming speeds decreased by 30% after pursing. The simulation results revealed that by 1500 s after casting the net, immature bigeye tunas could not pass through the body net because of the meshes of the net stretching in the longitudinal direction.

Free Research Field

水産物理