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Comparison of Target Strength of Pacific Herring (Clupea pallasii Valenciennes, 1847) from Ex-Situ Measurements and a Theoretical Model
- Source :
- Water, Vol 13, Iss 3009, p 3009 (2021), Water, Volume 13, Issue 21
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- 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<br />dB re 1 m2) of Pacific herring individuals (n = 14, total length (LT) = 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–LT relationship for the ex-situ measurements were TS38kHz = 20 log10(LT) − 70.10 (r = 0.17) and TS120kHz = 20 log10(LT) − 70.59 (r = 0.10). The least-squares regressions for the KRM model were TS38kHz = 20 log10(LT) − 68.39 (r = 0.40) and TS120kHz = 20 log10(LT) − 69.74 (r = 0.49). The b20 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.
- Subjects :
- biology
acoustic survey
Water supply for domestic and industrial purposes
Geography, Planning and Development
Pacific herring
KRM model
Clupea
target strength
Hydraulic engineering
Aquatic Science
biology.organism_classification
Biochemistry
Oceanography
ex-situ
parasitic diseases
Environmental science
Target strength
TC1-978
TD201-500
Water Science and Technology
Subjects
Details
- Language :
- English
- ISSN :
- 20734441
- Volume :
- 13
- Issue :
- 3009
- Database :
- OpenAIRE
- Journal :
- Water
- Accession number :
- edsair.doi.dedup.....3a019e98e81a60394f60c7bea8c39093