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Development of a simple non-invasive method for girth measurement and quantification of emaciation in free-ranging aquatic wild animals

Research Project

Project/Area Number 21K05726
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionMie University

Principal Investigator

Morisaka Tadamichi  三重大学, 生物資源学研究科, 教授 (00422923)

Co-Investigator(Kenkyū-buntansha) 濱 裕光  大阪公立大学, 大学院情報学研究科, 客員研究員 (20047377)
橋本 幸枝  追手門学院大学, 経営学部, 講師 (10846512)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsイルカ / 胴まわり / やせ具合 / モニタリング / 保全 / 胴回り
Outline of Research at the Start

本研究では、自由遊泳中の野生イルカの胴まわりを非接触で測定する手法を確立し、伊豆諸島・御蔵島のミナミハンドウイルカの年齢と胴まわりの関係性、およびその基準範囲(健常個体の95%が含まれる範囲)を設定する。また、簡便に判定できる「やせ指標」を作成し、その有効性を水族館のイルカを用いて確認したのち、御蔵島のイルカにて計測を行う。胴まわりや首まわりの推定精度向上のため、水族館でこれらの場所の形状を継続的に取得する。

Outline of Final Research Achievements

If we can continuously monitor the leanness of individuals in a wildlife population, we can quickly detect qualitative deterioration within the population. In this study, we validated the assumption of our previously developed non-contact method for measuring the girth of free-swimming wild dolphins (girth measured at the base of the dorsal fin) that "the girth of dolphins in water is elliptical" using five dolphins in aquariums, thereby demonstrating the accuracy of this method. Additionally, we developed a simpler "leanness index" based on the traced coordinates of the edge from the base of the rostrum to the anterior base of the dorsal fin. However, we found that this index is influenced by the vertical position of the neck and varies between juvenile and adult dolphins. We will continue to use these methods for monitoring wild dolphin populations.

Academic Significance and Societal Importance of the Research Achievements

野生動物の太り(痩せ)具合を知ることは,各個体の健康状態を知ることや,個体群全体の健全性を測るためにきわめて重要である.水中に生息するイルカにおいては,レーザー光など陸上で用いることのできる計測技術を用いることが困難である.本手法は既製品のビデオカメラを用いる手法であり,自由遊泳中の野生イルカと並んで泳ぎ撮影するだけで計測することができるのは画期的である.また,長期間行わなければならないモニタリングには,簡便な手法で誰でも行うことが重要であり,1つのビデオカメラで簡単に痩せ具合を判定できる本手法は最適であると言える.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Non‐invasive age estimation based on faecal DNA using methylation‐sensitive high‐resolution melting for Indo‐Pacific bottlenose dolphins2023

    • Author(s)
      Genfu Yagi, Huiyuan Qi, Kana Arai, Yuki F. Kita, Kazunobu Kogi, Tadamichi Morisaka, Motoi Yoshioka, Miho Inoue‐Murayama
    • Journal Title

      Molecular Ecology Resources

      Volume: 24 Issue: 2 Pages: 1-12

    • DOI

      10.1111/1755-0998.13906

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Predicting Dairy Cow Calving Time Using Markov Monte Carlo Simulation and Naïve Bayes Classifier2023

    • Author(s)
      Thi Thi Zin, Swe Zar Maw, Pyke Tin, Yoichiro Horii, Hiromitsu Hama
    • Journal Title

      ICIC Express Letters, Part B: Applications

      Volume: 14 Issue: 08 Pages: 877

    • DOI

      10.24507/icicelb.14.08.877

    • ISSN
      2185-2766
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Group definition for underwater observation of wild Indo-Pacific bottlenose dolphins2023

    • Author(s)
      Morisaka Tadamichi、Furuichi Tomo、Kogi Kazunobu、Yoshioka Motoi
    • Journal Title

      Journal of Ethology

      Volume: 41 Issue: 2 Pages: 141-151

    • DOI

      10.1007/s10164-023-00780-7

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Body length and growth pattern of free-ranging Indo-Pacific bottlenose dolphins off Mikura Island estimated using an underwater 3D camera2022

    • Author(s)
      Morisaka Tadamichi、Sakai Mai、Hama Hiromitsu、Kogi Kazunobu
    • Journal Title

      Mammalian Biology

      Volume: 102 Issue: 4 Pages: 1513-1523

    • DOI

      10.1007/s42991-022-00304-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Color Space Conversion Technique for Cattle Region Extraction with Application to Estrus Detection2022

    • Author(s)
      Yukie Hashimoto,Hiromitsu Hama,Thi Thi Zin
    • Journal Title

      ICIC Express Letters

      Volume: 16 Issue: 10 Pages: 1095

    • DOI

      10.24507/icicel.16.10.1095

    • ISSN
      1881-803X
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Noncontact method for estimating ellipticity around the girth of a free-ranging dolphin2021

    • Author(s)
      Hiromitsu Hama, Tadamichi Morisaka
    • Journal Title

      ICIC Express Letters

      Volume: 15 Pages: 1-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Hybrid Approach: Markov Monte Carlo and Naive Bayes Theorem to Predict Dairy Cow Calving Time2022

    • Author(s)
      Thi Thi Zin, Swe Zar Maw, Pyke Tin, Yoichiro Horii and Hiromitsu Hama
    • Organizer
      16th International Conference on Innovative Computing, Information and Control (ICICIC2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Cattle region extraction using color space conversion2021

    • Author(s)
      Yukie Hashimoto, Hiromitsu Hama and Thi Thi Zin
    • Organizer
      15th International Conference on Innovative Computing, Information and Control (ICICIC2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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