What kind of larval fish survive? : 3D tracking experiment for small pelagic fishes

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15590
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 40030:Aquatic bioproduction science-related
• Research Institution: Fisheries Research and Education Agency
• Principal Investigator: Nakamura Masahiro 国立研究開発法人水産研究・教育機構, 水産技術研究所(廿日市), 研究員 (00781832)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: 生活史戦略 / 浮魚類 / 進化 / 水産資源管理 / 行動

Outline of Final Research Achievements

The relationships between growth rate and swimming performance were tested on three small pelagic fishes (chub mackerel, Japanese anchovy, Japanese sardine). As predicted form previous field studies, positive growth-locomotor relationships were detected in all of the three species. However, the relationships were quite complicated. In chub mackerel, growth-locomotor relationship was non-linear. In case of Japanese anchovy, positive relationships were evident at 22°C but no significant relationships were detected under 26°C and 16°C.

Free Research Field

進化生態学、水産資源学

Academic Significance and Societal Importance of the Research Achievements

本研究は、知見が限られた外洋性魚類を用いた実験を通じて、あらゆる動物群の中で初めて成長速度と運動能力の正相関関係を報告したものであり、生態学・進化学の発展に資するものである。また、サバ・イワシ類の生活史初期における成長速度と運動能力の関係の実態は、これまでに全く検証がなく、謎に包まれていた。この関係性が初めて詳細に明らかになったことで、水産学上の重要な課題である、加入量予測の高精度化にも大きく貢献する。