Acoustic Characteristics of Largehead Hairtail (Trichiurus japonicus) Using Multi-Frequency Detection in the Southern Sea, South Korea
Abstract
:1. Introduction
2. Materials and Methods
2.1. Collection of Acoustic Data
2.2. Midwater Trawl Survey
2.3. Analysis of Acoustic Data
3. Results
3.1. Midwater Trawl Catch
3.2. Hairtail Echograms and Frequency Characteristics
4. Discussion
4.1. Biological Characteristics
4.2. Acoustic Characteristics
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Trawl (Station) | Date | Location | Trawl Depth (m) | Speed (Knots) | |
---|---|---|---|---|---|
Latitude (N) | Longitude (E) | ||||
1 | 17 April 2022 | 34°6.3′ | 128°14.0′ | 63–90 | 3.7 |
2 | 21 April 2022 | 34°11.8′ | 127°57.9′ | 50–71 | 4.0 |
Parameter | Value (m) |
---|---|
Minimum total school height | 2 |
Minimum candidate length | 5 |
Minimum candidate height | 1 |
Maximum vertical linking distance | 5 |
Maximum horizontal linking distance | 10 |
Maximum total school length | 10 |
Trawl (Station) | Species | Individual (n) | Individual (%) | Total Weight (kg) | Total Weight (%) | Remarks |
---|---|---|---|---|---|---|
1 | Trichiurus japonicus | 1096 | 98.47 | 1.33 | 81.60 | |
Todarodes pacificus | 14 | 1.26 | 0.04 | 2.45 | ||
Other | 3 | 0.27 | 0.26 | 15.95 | 3 species | |
2 | Trichiurus japonicus | 1654 | 95.66 | 165.54 | 93.63 | |
Sphyraena pinguis | 23 | 1.33 | 1.78 | 1.01 | ||
Pennahia argentata | 15 | 0.87 | 3.33 | 1.88 | ||
Trachurus japonicus | 13 | 0.75 | 0.64 | 0.36 | ||
Pampus argenteus | 11 | 0.64 | 1.93 | 1.09 | ||
Other | 13 | 0.75 | 3.59 | 2.03 | 8 species |
Characteristic | Range | Mean ± SD |
---|---|---|
Height (m) | 0.5–4.0 | 1.7 ± 0.9 |
Length (m) | 0.7–13.9 | 5.8 ± 3.7 |
Thickness (m) | 0.8–4.1 | 1.9 ± 1.0 |
Perimeter (m) | 2.5–62.2 | 22.6 ± 15.3 |
Area (m2) | 0.5–39.7 | 8.2 ± 10.3 |
Taxon | ∆MVBS18–38 (dB) | ∆MVBS70–38 (dB) | ∆MVBS120–38 (dB) | ∆MVBS200–38 (dB) |
---|---|---|---|---|
Juvenile | 2.17 ± 4.84 | −6.99 ± 3.01 | −9.20 ± 2.87 | −11.35 ± 3.32 |
Immature | 3.23 ± 5.23 | −5.12 ± 5.21 | −6.29 ± 5.39 | −9.13 ± 4.99 |
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Lee, H.; Yoon, E.; Lee, S.; Lee, J. Acoustic Characteristics of Largehead Hairtail (Trichiurus japonicus) Using Multi-Frequency Detection in the Southern Sea, South Korea. J. Mar. Sci. Eng. 2023, 11, 1918. https://doi.org/10.3390/jmse11101918
Lee H, Yoon E, Lee S, Lee J. Acoustic Characteristics of Largehead Hairtail (Trichiurus japonicus) Using Multi-Frequency Detection in the Southern Sea, South Korea. Journal of Marine Science and Engineering. 2023; 11(10):1918. https://doi.org/10.3390/jmse11101918
Chicago/Turabian StyleLee, Hyungbeen, Euna Yoon, Seungjong Lee, and Jeonghoon Lee. 2023. "Acoustic Characteristics of Largehead Hairtail (Trichiurus japonicus) Using Multi-Frequency Detection in the Southern Sea, South Korea" Journal of Marine Science and Engineering 11, no. 10: 1918. https://doi.org/10.3390/jmse11101918
APA StyleLee, H., Yoon, E., Lee, S., & Lee, J. (2023). Acoustic Characteristics of Largehead Hairtail (Trichiurus japonicus) Using Multi-Frequency Detection in the Southern Sea, South Korea. Journal of Marine Science and Engineering, 11(10), 1918. https://doi.org/10.3390/jmse11101918