Research for migration and distribution of pointhead flounder in Funka Bay, Hokkaido using acoustic methods

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15891
• 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: Hasegawa Kohei 北海道大学, 水産科学研究院, 助教 (30826558)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ソウハチ / スケトウダラ / 資源分布 / 計量魚群探知機

Outline of Final Research Achievements

To estimate predation pressure of pointhead flounder on juvenile walleye pollock in Funka Bay, Hokkaido, We investigated the distribution of the both species in the area. Surveys were conducted from April to June when the both species appears in the area. Relative large school of pointhead flounder and walleye pollock was observed and the distribution of the both species overlapped. The overlapping gradually became smaller in scale in May and in June. The results implied that the predation pressure of pointhead flounder on juvenile walleye pollock was largest in April.

Free Research Field

水産音響

Academic Significance and Societal Importance of the Research Achievements

本研究で対象としたソウハチやスケトウダラは，水産資源として重要な魚種である。これらの生物の被食・捕食の作用に関する知見は，それぞれの生物の資源量に直接関わる事から重要な指標となる。本研究では，両種がどれほどの規模で遭遇するかによって捕食の程度に影響すると考え，音響的手法を用いて両種の資源分布を調査した。本研究で得られた結果から，いつ，どの程度の捕食が行われたかを推測できるようになれば，両種の資源管理を行う上でも重要な指標となると考えられる。