Ex Situ Measurement of Target Strength Variability in Tongkol Komo (Euthynnus affinis) at Different Tilt Angles Using Broadband Echosounder

Authors

  • Moh. Rafli Furqan Hidayat Marine Technology Study Program, Department of Marine Science and Technology, Faculty of Marine Sciences and Fisheries, IPB University, Bogor, West Java, 16680, Indonesia Author
  • Henry Munandar Manik Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University, Bogor, West Java, 16680, Indonesia Author https://orcid.org/0000-0002-4418-5815
  • Totok Hestirianoto Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University, Bogor, West Java, 16680, Indonesia Author https://orcid.org/0000-0002-1636-4525
  • Syahrul Purnawan Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Syiah Kuala. Jl. Tgk. Syech Abdul Rauf, Syiah Kuala, Banda Aceh 23111,Aceh, Indonesia Author https://orcid.org/0000-0002-4808-224X

Keywords:

Target strength, Acoustic tank, Broadband, Echosounder, Tongkol komo (Euthynnus affinis)

Abstract

Accurate target strength (TS) measurements are essential for understanding acoustic backscatter from fish, influenced by factors like frequency and orientation. This study analyzed TS values from Tongkol Komo (Euthynnus affinis) samples (fork lengths 27,4 cm) using a broadband echosounder. This study also analyzed the different angles effect to TS values. TS were conducted in an acoustic tank using a Simrad EK80 Wide Band Transceiver with a split-beam transducer over 160–260 kHz. Fish samples were dead and placed under the transducer at tilt angles of –45°, 0°, and +45°. Data were processed with ESP3 software. Results showed TS mean fluctuations with angle: at 0°, TS increased from –31.72 dB to –19.00 dB; at +45°, TS ranged from –40.86 dB to –22.88 dB; and at –45°, from –41.33 dB to –24.37 dB. These findings highlight angle-dependent TS variability, supporting broadband acoustics for detailed fish characterization. 

Author Biographies

  • Henry Munandar Manik, Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University, Bogor, West Java, 16680, Indonesia

    Henry Manik is a Professor at the Department of Marine Science and Technology, IPB University, Bogor, Indonesia. His research interests include Underwater Acoustic Engineering, Fisheries Acoustics,  Sonar Systems, and Marine Instrumentation.

  • Totok Hestirianoto, Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University, Bogor, West Java, 16680, Indonesia

    Lecturer at Department of Marine Science and technology Bogor Agricultural University

  • Syahrul Purnawan, Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Syiah Kuala. Jl. Tgk. Syech Abdul Rauf, Syiah Kuala, Banda Aceh 23111,Aceh, Indonesia

    Lecturer at Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Syiah Kuala

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Published

2025-12-09

Issue

2025: Program Book FiSAED: Sustainable Natural Resources and Environmental Management

Section

Sustainable natural resources and environmental management