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Volume backscattering spectra measurements of Antarctic krill using a broadband echosounder

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  • Fisheries
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Abstract

For the acoustic inference of lengths and orientation angles of Antarctic krill (krill), reliable theoretical acoustic scattering models and parameters are necessary. To measure the volume backscattering (SV) spectra, and to clarify if the spectral shapes of target strength (TS) predicted by the stochastic distorted-wave Born approximation-based deformed cylinder model (SDWBA-DCM) are in agreement with those of the measured SV, we conducted simultaneous sampling with a broadband echosounder and a rectangular midwater trawl targeting 9 aggregations in the eastern Indian sector of the Antarctic in the 2018/19 austral summer. The SV spectra were measured at 50–85 kHz and 95–255 kHz. Using the SDWBA-DCM and the length frequency distribution obtained from the trawl samples, the length-averaged TS spectra were predicted. Both spectra were normalized by SV and TS values at 120 kHz, respectively, and the relative frequency responses were compared. The spectral shapes were in reasonable agreement in the case of the aggregations dominated by krill smaller than 35 mm. On the other hand, in the case of the krill larger than 35 mm, the spectral shapes were not in agreement. The possible causes of the discrepancy included the orientation angle distribution and the shape of krill.

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Acknowledgements

We are deeply grateful to the officers, crew, and researchers onboard the R/V Kaiyo-Maru for their assistance with the sampling. The survey was supported by the Institute of Cetacean Research, the Japan Fisheries Research and Education Agency, and the Fisheries Agency of Japan.

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Authors and Affiliations

  1. Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo, 108-8477, Japan

    Natsuki Yamamoto, Kazuo Amakasu & Hiroto Murase

  2. Fisheries Resources Research Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa, 236-8648, Japan

    Koki Abe

  3. Fisheries Resources Research Institute, Japan Fisheries Research and Education Agency, 1-5939-22, Suido-cho, Chuou-ku, Niigata, Niigata, 951-8121, Japan

    Ryuichi Matsukura

  4. Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 7620-7 Hasaki, Kamisu, Ibaraki, 314-0408, Japan

    Tomohito Imaizumi & Tomohiko Matsuura

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  1. Natsuki Yamamoto
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  2. Kazuo Amakasu
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  3. Koki Abe
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Correspondence to Kazuo Amakasu.

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Yamamoto, N., Amakasu, K., Abe, K. et al. Volume backscattering spectra measurements of Antarctic krill using a broadband echosounder. Fish Sci 89, 301–315 (2023). https://doi.org/10.1007/s12562-023-01678-6

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