Geolocation of free-ranging demersal fish using tidal location method, bottom temperature by data assimilation system, and depth data

2016 Fiscal Year Final Research Report

• Project/Area Number: 26450263
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Nagasaki University
• Principal Investigator: KAWABE Ryo 長崎大学, 海洋未来イノベーション機構, 教授 (80380830)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: バイオロギング / データ同化 / ヒラメ / マツカワ / 移動生態

Outline of Final Research Achievements

Geolocation using the tidal location method (TLM), which uses tidal data recorded by DSTs, has proved helpful in reconstructing the most probable track of tagged fish. In order to extend time range of successful geolocation, it is first necessary to extract the tidal signal from the depth recordings on the DSTs, and then to compare the resulting data to output from an ocean tide model. Furthermore, using statistical criteria within an estimated geographical region of confidence that was constrained by environmental and biological data (bottom depth and swimming speed), to reconstruct the geolocation of the fish. However, the current TLM approach has technical limitations. And so, we developed a new methodology that includes the diurnal K1 constituent, the second largest harmonic constituent, and bottom temperatures predicted by the data assimilated ocean model, the Japan Coastal Ocean Predictability Experiment (JCOPE2).

Free Research Field

魚類行動生態学