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

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Title: Target Strength Measurements of Free-Swimming Sandeel Species, Ammodytes spp., in a Large Indoor Experimental Aquarium
Authors: Zhu, Yanhui Browse this author
Mizutani, Kosuke Browse this author
Minami, Kenji Browse this author →KAKEN DB
Shirakawa, Hokuto Browse this author
Kawauchi, Yohei Browse this author
Shao, Huamei Browse this author
Tomiyasu, Makoto Browse this author →KAKEN DB
Iwahara, Yuka Browse this author
Tamura, Tsutomu Browse this author
Ogawa, Masahiro Browse this author
Tatsuyama, Kai Browse this author
Miyashita, Kazushi Browse this author →KAKEN DB
Keywords: sandeel species
quantitative echo sounder
practical TS
Issue Date: 14-Jul-2022
Publisher: MDPI
Journal Title: Journal of Marine Science and Engineering
Volume: 10
Issue: 7
Start Page: 966
Publisher DOI: 10.3390/jmse10070966
Abstract: 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.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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