| Project/Area Number |
12660162
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KOMATSU Teruhisa The University of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所, 助教授 (60215390)
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| Co-Investigator(Kenkyū-buntansha) |
INAGAKI Tadashi The University of Tokyo, Ocean Research Institute, Researcher, 海洋研究所, 教務職員 (00151572)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | GIS / acoustic survey / echosounder / mapping / differential-GPS / seagrass / seaweed beds / coastal environment / mesopelagic fish / 計量魚群探知機 / サイドスキャンソナー / 中深属性魚類 / 資源量 / 浮魚 / 魚探 / スプリットビーム / D-GPS / キンメダイ / 持続的漁業 / 生物量推定 |
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| Research Abstract |
This study aimed to develop quick assessment methods of aquatic living resources using Geographical Information System (GIS). We measured mesopelagic fishes and seagrass/seaweed beds, which haven't investigated, with quantitative echosounders and acoustic measurement instruments. We quantified alfonsin (Beryx splendens), one of the most important mesopelagic commercial fish around seamounts in Japanese exclusive economic zone by using a split-beam echosounder. We mapped precise bottom topography of seamounts with multibeam sonar and differential-GPS. These data were incorporated into the system that can quickly assess the relation between quantitative fish distribution and bottom topography using GIS. We also developed the system that can show substrate including seagrass scanned by echosounder on the display of portable personal computer in real time. The developed software processes signals from the echosounder and D-GPS and classify substrate localizing ship position with GPS. We made field surveys on seagrass and seaweed beds in Sanriku Coast, in Miura Peninsula of Kanagawa Prefecture and Posidonia beds in Mediterranean Sea. Sea truth was also done in these areas. In Sanriku Coast, we studied ecology and biomass of Zostera caulescens. In addition, we made analysis with GIS on change in intertidal ecosystem polluted by Nakhodka oil spill accident and management of coastal area as studies using GIS applied to fisheries science and fisheries oceanography. Acoustic survey has needed highly specialized knowledge for use and produced large quantity of data. Therefore acoustic survey has been very complicated method to estimate resources. Acoustic survey is recommended to estimate fisheries resources because it is independent from the fisheries activity. Our study succeeded to develop easy quick assessment methods integrating GIS and acoustic survey data. We plane to develop another quick assessment methods for other marine bioresosauces with variety of life forms.
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