Comparison of Target Strength of Pacific Herring (<i>Clupea pallasii</i> Valenciennes, 1847) from Ex-Situ Measurements and a Theoretical Model
Pacific herring (<i>Clupea pallasii</i> 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<sup>2</sup>) of Pacific herring individu...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/128dde38d3ec449eac4aac4d39b22416 |
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| Sumario: | Pacific herring (<i>Clupea pallasii</i> 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<sup>2</sup>) of Pacific herring individuals (<i>n</i> = 14, total length (<i>L</i><sub>T</sub>) = 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–<i>L</i><sub>T</sub> relationship for the ex-situ measurements were TS<sub>38kHz</sub> = 20 log<sub>10</sub>(<i>L</i><sub>T</sub>) − 70.10 (r = 0.17) and TS<sub>120kHz</sub> = 20 log<sub>10</sub>(<i>L</i><sub>T</sub>) − 70.59 (r = 0.10). The least-squares regressions for the KRM model were TS<sub>38kHz</sub> = 20 log<sub>10</sub>(<i>L</i><sub>T</sub>) − 68.39 (r = 0.40) and TS<sub>120kHz</sub> = 20 log<sub>10</sub>(<i>L</i><sub>T</sub>) − 69.74 (r = 0.49). The <i>b</i><sub>20</sub> 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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