Target Strength Measurements of Free-Swimming Sandeel Species, Ammodytes spp., in a Large Indoor Experimental Aquarium

Zhu, Yanhui; Mizutani, Kosuke; Minami, Kenji; Shirakawa, Hokuto; Kawauchi, Yohei; Shao, Huamei; Tomiyasu, Makoto; Iwahara, Yuka; Tamura, Tsutomu; Ogawa, Masahiro; Tatsuyama, Kai; Miyashita, Kazushi

Target Strength Measurements of Free-Swimming Sandeel Species, Ammodytes spp., in a Large Indoor Experimental Aquarium

Zhu, Yanhui; Mizutani, Kosuke; Minami, Kenji et al.

Journal of Marine Science and Engineering, 2022, 10(7), 966

Permalink : https://hdl.handle.net/2115/86633

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アクセス権	open access
URI	https://hdl.handle.net/2115/86633
タイトル	Target Strength Measurements of Free-Swimming Sandeel Species, Ammodytes spp., in a Large Indoor Experimental Aquarium
著者	Zhu, Yanhui ; Mizutani, Kosuke ; Minami, Kenji ; Shirakawa, Hokuto ; Kawauchi, Yohei ; Shao, Huamei ; Tomiyasu, Makoto ; Iwahara, Yuka ; Tamura, Tsutomu ; Ogawa, Masahiro ; Tatsuyama, Kai ; Miyashita, Kazushi
著者名 Zhu, Yanhui
著者名 Mizutani, Kosuke
e-Rad_Researcher 50793915 著者名 Minami, Kenji
著者名 Shirakawa, Hokuto
著者名 Kawauchi, Yohei
著者名 Shao, Huamei
e-Rad_Researcher 50837101 著者名 Tomiyasu, Makoto
著者名 Iwahara, Yuka
著者名 Tamura, Tsutomu
著者名 Ogawa, Masahiro
著者名 Tatsuyama, Kai
e-Rad_Researcher 70301877 著者名 Miyashita, Kazushi
言語	英語
キーワード	sandeel species
	bladderless
	free-swimming
	quantitative echo sounder
	practical TS
発行日	2022-07-14
出版者	MDPI
収録物名	Journal of Marine Science and Engineering
巻(号)	10(7)
ページ	966
抄録	The sandeel species (Ammodytes spp.) occupy a critical ecological position in connecting lower trophic levels to higher ones. However, they are strongly affected by the marine environment and their catch rates are trending downward. In this study, the target strength (TS) of sandeel species was measured in free-swimming specimens using a split-beam quantitative echo sounder with 38 and 120 kHz frequencies in a physically controlled environment. Parameters a and b used in the estimated TSmean-fork length (FL: 13.5-21.5 cm) equation were 53.7 and -124.3 dB at 38 kHz, and 71.3 and -153.2 dB at 120 kHz, respectively. The TS of the sandeel species were not proportional to the square of the FL but increased relatively rapidly with increasing body size. In addition, the mean and standard deviation of the swimming angle for the sandeel species from the acoustic data at 120 kHz were -2.2 degrees and 7.7 degrees, respectively, and most were in the -30 degrees to 30 degrees, range. Furthermore, TS was stronger at 38 kHz than at 120 kHz for all FL classes. The use of such frequency characteristics could facilitate the discrimination of fish species in the field and the sustainable assessment of sandeel species stocks.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.3390/jmse10070966