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Challenge to species identification with high-resolution echosounders -analysis of fish-school echoes with machine learning-

Research Project

Project/Area Number 20K21329
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

Amakasu Kazuo  東京海洋大学, 学術研究院, 教授 (80452043)

Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords魚種判別 / 魚群探知機 / スペクトル / 機械学習 / 高分解能魚群探知機 / 魚群エコー
Outline of Research at the Start

適切な漁獲や正確な資源量推定を可能とするために、魚群探知機に映った魚群の魚種を判別できるようにしたい。そこで本研究では、魚種ごとに異なると考えられる魚群の内部構造に注目し、高分解能な魚群探知機を使用して魚群内部の個々の魚まで観測できるようにする。さらに、内部構造の特徴量(魚の個体間距離、推定体長、遊泳行動など)を抽出し、魚群によって内部構造の特徴量に規則性やパターンがあるか機械学習手法の一つである「教師なし機械学習」によって明らかにする。これにより、魚群探知機による魚種判別へ道を開く。

Outline of Final Research Achievements

In this study, the internal structures of fish-schools were observed with a high-resolution echosounder. Amplitude spectra, echo-intensity spectra, variation spectra of echo intensity, and morphology of fish-schools were extracted as the feature quantity of fish-schools and were confirmed that some of them were useful information for species identification. The window sizes of fast Fourie transform to obtain accurate echo-intensity spectra were clarified and the echo processing method was improved. The internal structures of fish-schools could be observed, but it was also clarified that such observations were difficult for deeper fish-schools and higher densities. Although clustering of fish-school echoes was tried with an unsupervised machine learning, it was difficult to determine appropriate number of clusters.

Academic Significance and Societal Importance of the Research Achievements

高分解能魚探は魚種判別に道を開くと期待されてきたが,特徴量の抽出についてはエコーデータの処理方法も含めて未だ十分に研究がなされていない。その点,本研究は複数の特徴量を抽出し,魚種判別に有用な情報となることを確かめた。また,エコー処理方法の高度化もしている。魚種との対応付けが不十分であったが,魚種判別問題の解決に資する研究成果であり学術的意義がある。
魚種判別手法は,魚群探知機を使用した効率的な漁獲および正確な資源量推定に必要である。魚探による魚種判別技術の確立は「水産資源の保全(管理)と持続的な利用」すなわち食料の安定供給に寄与するものであり,ここに本研究成果の社会的意義がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (2 results)

All 2023 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Effects of fast Fourier transform window size on the target strength spectra of tungsten carbide spheres2023

    • Author(s)
      Jing Liu, Burak Saygili, Akira Iwasa, Natsuki Yamamoto, Tomohito Imaizumi, Kazuo Amakasu
    • Journal Title

      Fisheries Science

      Volume: 89 Issue: 2 Pages: 147-157

    • DOI

      10.1007/s12562-022-01653-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Experimental study on the measurement of calibration sphere echoes by broadband scientific echosounders2021

    • Author(s)
      Jing Liu, Burak Saygili, Akira Iwasa, Tomohito Imaizumi, and Kazuo Amakasu
    • Organizer
      The Fourteenth Annual Meeting of Asian Fisheries Acoustics Society
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2020-08-03   Modified: 2024-01-30  

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