Development of biologically acceptable catch quota algorithm considering multiple fish species

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K06180
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40030:Aquatic bioproduction science-related
• Research Institution: Yokohama National University
• Principal Investigator: Matsuda Hiroyuki 横浜国立大学, 総合学術高等研究院, 特任教員(教授) (70190478)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: マイワシ / 生物学的許容漁獲量 / 漁獲可能量 / 漁獲圧 / 漁獲量制御規則

Outline of Final Research Achievements

To address long-term fluctuations in resources, we proposed a fisheries management strategy that integrates Total Allowable Catch (TAC) management with fishing pressure limits, in addition to the existing resource management based on the biological allowable catch (ABC) decision rule. By analyzing actual recruitment rate fluctuations of the Pacific stock of Japanese sardine since the 1970s, we compared resource dynamics under retrospective implementation of the current TAC management alone versus when fishing pressure regulation was also applied. Our findings indicate that the proposed fisheries management, which combines TAC and fishing pressure regulation, resulted in increased catch and resource abundance. This underscores the effectiveness of a management strategy that considers long-term fluctuations, such as regime shifts, and integrates fishing pressure regulation with TAC management.

Free Research Field

生態学、環境学、 環境リスク、

Academic Significance and Societal Importance of the Research Achievements

現在に至るまで、レジームシフトや種間関係等による加入率の中長期変動は、許容漁獲量決定規則に十分反映されないまま、漁獲量が決められている。それが、レジームシフト研究者や漁業者からの不信を招いている側面がある。より合理的な方法を追求することにより、生態系アプローチに基づく資源管理の道が開かれると期待される。