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Development of a real-time depth monitoring system for small fishing gear using an acoustic telemetry technique

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  • Fisheries
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Abstract

A system for real-time monitoring the depth of small fishing gear was developed using acoustic telemetry to improve the efficiency of fishing operations. The system consisted of an acoustic transmitter (pinger), an omni-directional hydrophone with a depressor, and a receiver. Using a pinger equipped with a depth sensor, a fisherman can confirm whether the fishing gear is at the intended depth. The battery of the developed pinger can be replaced easily for repeated use. The performance of the system was evaluated in a field experiment. The accuracy of measured depth was 0.4 m and was constant even if the pinger was moving. In the experiment, the system could successfully monitor the pinger depth every several second. The system was implemented in hairtail trolling to examine its effectiveness. The implementation experiments revealed some issues with the system, such as the effect of signal reflections or the installation method of the hydrophone. However, the system could monitor the depth of the fishing gear continuously in real time and it operated successfully without any problem during the fishing operation. Application of the developed system is expected to aid fishermen in adjusting the gear depth easily and accurately.

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Acknowledgments

This study was supported by JSPS KAKENHI Grant Number 2510728. We would like to thank Dr. Toyoki Sasakura and Mr. Yuzo Abe of FUSION Inc. for their technical support. We would also like to thank Mr. Akira Adachi, President of KODEN Inc., for arranging the experiments, and Captain Kazuo Hatozaki for his support during the field experiments.

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Authors and Affiliations

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

    Kohei Hasegawa, Yoshinori Miyamoto & Keiichi Uchida

  2. Japan Society for the Promotion of Science, Tokyo, Japan

    Kohei Hasegawa

Authors
  1. Kohei Hasegawa
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  2. Yoshinori Miyamoto
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  3. Keiichi Uchida
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Correspondence to Yoshinori Miyamoto.

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Hasegawa, K., Miyamoto, Y. & Uchida, K. Development of a real-time depth monitoring system for small fishing gear using an acoustic telemetry technique. Fish Sci 82, 213–223 (2016). https://doi.org/10.1007/s12562-015-0963-7

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  • DOI: https://doi.org/10.1007/s12562-015-0963-7

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