Estimating target strength of young chum salmon ( Oncorhynchus keta)

Although chum salmon (Oncorhynchus keta) is an important fishery resource in Japan, acoustic methods cannot be applied to biomass estimation because the target strength (TS) is unknown. This study clarified the TS for each fork length (FL: 5.5–33.5 cm) of young chum salmon inhabiting the Japanese co...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Minami, Kenji, Shirakawa, Hokuto, Kawauchi, Yohei, Shao, Huamei, Tomiyasu, Makoto, Iwahara, Yuka, Tsuda, Yuichi, Takahara, Hideo, Zhu, Yanhui, Miyashita, Kazushi
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2022
Subjects:
Bering Sea
Online Access:http://dx.doi.org/10.1139/cjfas-2021-0181
https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0181
https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0181
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Summary:Although chum salmon (Oncorhynchus keta) is an important fishery resource in Japan, acoustic methods cannot be applied to biomass estimation because the target strength (TS) is unknown. This study clarified the TS for each fork length (FL: 5.5–33.5 cm) of young chum salmon inhabiting the Japanese coastal area to the Bering Sea by measuring free-swimming fish. The size dependences of the TS values were TS mean = 20 log 10 FL – 68.0, for both 38 and 120 kHz. This facilitated the estimation of biomass of young salmon using acoustic methods.

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