Establishment of behavioral monitoring method of bivalves (oysters and scallops) for the construction of environmentally adaptive aquaculture

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15575
• 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: Hokkaido University
• Principal Investigator: Tomiyasu Makoto 北海道大学, 水産科学研究院, 助教 (50837101)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 二枚貝養殖 / 行動モニタリング / 環境適応 / マガキ / ホタテガイ / 成長 / 漁具

Outline of Final Research Achievements

We attempted to establish a method for monitoring the status and behavior of the important fishery resources, Pacific oyster and scallop, based on their shells' opening and closing motions.
In both species, we devised a method to quantify the opening and closing movements of the shells using acceleration sensors and magnetic sensors and succeeded in the long-term measurement of their behaviors.
In indoor experiments, we clarified the characteristics of movements specific to feeding, defecation, and spawning in the Pacific oyster. In scallops, the characteristics of feeding and movement behavior were clarified, and the effects of different culturing methods on behavior were verified. For oysters, field experiments were conducted in aquaculture farms to clarify the trend of valve movement, spawning diversity, the movement of aquaculture baskets, the growth characteristics of individuals in each basket, and the effects of different baskets on movements.

Free Research Field

水圏生産科学

Academic Significance and Societal Importance of the Research Achievements

本研究を通じて、水産重要種の二枚貝の長期的な行動モニタリングが可能となり、養殖現場での成長や状態を評価するのみならず生態情報の知見を蓄積することが可能となった。特に二枚貝養殖で問題視されている個体の大量斃死がどのような条件で発生し、どのように対策をしていくべきかを考える上でこれら知見の収集は不可欠である。また本研究は、比較的簡易な計測手法によって行われ、養殖業を営む漁業者や地方自治体と共に研究を行ってきた。そのため、地域に研究の手法・成果が実装されつつあり、今後地域独自に調査を展開し知見を蓄積していくことで、研究の発展が期待される。