4.6 Article

Comparison of Target Strength of Pacific Herring (Clupea pallasii Valenciennes, 1847) from Ex-Situ Measurements and a Theoretical Model

Journal

WATER
Volume 13, Issue 21, Pages -

Publisher

MDPI
DOI: 10.3390/w13213009

Keywords

Pacific herring; target strength; acoustic survey; ex-situ; KRM model

Funding

  1. National Institute of Fisheries Science, Korea [R2021031]
  2. Ministry of Oceans and Fisheries, Korea [20210499]
  3. Institute of Planning & Evaluation for Technology in Food, Agriculture, Forestry & Fisheries (iPET), Republic of Korea [R2021031] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study analyzed the target strength of Pacific herring individuals at 38 and 120 kHz using ex-situ measurements and KRM model, providing basic data for evaluating the distribution and abundance of Pacific herring using fisheries' acoustic technology.
Pacific herring (Clupea pallasii Valenciennes, 1847) is a commercially important species that inhabits the coastal waters of the North Pacific from Korea to California, USA. This study analyzed the target strength (TS; dB re 1 m(2)) of Pacific herring individuals (n = 14, total length (L-T) = 21.3-32.3 cm) at 38 and 120 kHz using ex-situ measurements and the Kirchhoff-ray mode (KRM) model. The least-squares regressions of the TS-L-T relationship for the ex-situ measurements were TS38kHz = 20 log(10)(L-T) - 70.10 (r = 0.17) and TS120kHz = 20 log(10)(L-T) - 70.59 (r = 0.10). The least-squares regressions for the KRM model were TS38kHz = 20 log(10)(L-T) - 68.39 (r = 0.40) and TS120kHz = 20 log(10)(L-T) - 69.74 (r = 0.49). The b(20) value of the KRM model was 1.71 dB higher than that of the ex-situ measurement at 38 kHz but similar at 120 kHz. These results provide basic data to evaluate the distribution and abundance of Pacific herring using fisheries' acoustic technology.

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