Size Selectivity of a Diamond-Mesh Codend of Demersal Trawl for Largehead Hairtail (Trichiurus lepturus Linnaeus, 1758) in the Beibu Gulf, in the South China Sea
Abstract
:1. Introduction
2. Materials and Methods
2.1. Fishing Experiments
2.2. Data Analysis
2.2.1. The Selectivity Curve and the Parameters Estimation
2.2.2. The Abundance–Biomass Comparison Curve
3. Results
3.1. Overview of the Catch Species in the Sea Trials
3.2. Size Selectivity of Codends with Different Mesh Sizes
3.3. ABC Curve Characteristics
4. Discussion
4.1. The Size Selectivity of Codends with Different Mesh Sizes
4.2. Impact of Trawling on Fishery Resources
4.3. Prospects for Trawl Fisheries
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Codend | Nominal Mesh Size (mm) | Mesh Opening (mm) ± SD | Description |
---|---|---|---|
D30 | 30 | 23.38 ± 1.08 | 660 × 450 |
D35 | 35 | 27.03 ± 1.40 | 560 × 385 |
D40 | 40 | 30.06 ± 0.83 | 495 × 340 |
D45 | 45 | 35.46 ± 1.50 | 440 × 300 |
Cover | 15 | 12.45 ± 0.98 | 2000 × 1400 |
Parameters | D30 | D35 | D40 | D45 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Logistic a | Richards | Logistic | Richards a | Logistic a | Richards | Logistic | Richards a | |||||||||
a | −6.583 | (0.892) | −6.496 | (3.597) | −6.330 | (0.468) | −1.944 | (3.575) | −5.363 | (0.695) | −5.234 | (3.313) | −7.611 | (0.618) | −3.259 | (2.329) |
b | 0.577 | (0.073) | 0.557 | (0.191) | 0.524 | (0.036) | 0.407 | (0.059) | 0.415 | (0.055) | 0.427 | (0.156) | 0.561 | (0.046) | 0.403 | (0.066) |
δ | 1.119 | (1.049) | 0.085 | (0.238) | 0.821 | (0.817) | 0.169 | (0.235) | ||||||||
L50 | 11.40 | (0.27) | 11.38 | (0.37) | 12.08 | (0.16) | 11.65 | (0.21) | 12.92 | (0.25) | 12.89 | (0.26) | 13.56 | (0.19) | 13.28 | (0.22) |
SR | 3.81 | (0.48) | 4.10 | (1.24) | 4.19 | (0.29) | 3.98 | (0.37) | 5.30 | (0.70) | 4.86 | (1.47) | 3.91 | (0.32) | 4.14 | (0.39) |
H0: Model fit | ||||||||||||||||
Deviance | 15.69 | 15.63 | 37.73 | 21.66 | 31.53 | 30.84 | 34.81 | 26.27 | ||||||||
DOF | 19 | 18 | 28 | 27 | 26 | 25 | 30 | 29 | ||||||||
p-value | 0.678 | 0.619 | 0.104 | 0.755 | 0.209 | 0.194 | 0.250 | 0.611 | ||||||||
H1: δ = 1 | ||||||||||||||||
Deviance | 0.06 | 16.07 | 0.68 | 8.54 | ||||||||||||
DOF | 1 | 1 | 1 | 1 | ||||||||||||
p-value | 0.802 | <0.05 | 0.408 | <0.05 |
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Yan, L.; Yang, B.; Zhang, P.; Li, J.; Wang, T. Size Selectivity of a Diamond-Mesh Codend of Demersal Trawl for Largehead Hairtail (Trichiurus lepturus Linnaeus, 1758) in the Beibu Gulf, in the South China Sea. J. Mar. Sci. Eng. 2023, 11, 1444. https://doi.org/10.3390/jmse11071444
Yan L, Yang B, Zhang P, Li J, Wang T. Size Selectivity of a Diamond-Mesh Codend of Demersal Trawl for Largehead Hairtail (Trichiurus lepturus Linnaeus, 1758) in the Beibu Gulf, in the South China Sea. Journal of Marine Science and Engineering. 2023; 11(7):1444. https://doi.org/10.3390/jmse11071444
Chicago/Turabian StyleYan, Lei, Bingzhong Yang, Peng Zhang, Jie Li, and Teng Wang. 2023. "Size Selectivity of a Diamond-Mesh Codend of Demersal Trawl for Largehead Hairtail (Trichiurus lepturus Linnaeus, 1758) in the Beibu Gulf, in the South China Sea" Journal of Marine Science and Engineering 11, no. 7: 1444. https://doi.org/10.3390/jmse11071444
APA StyleYan, L., Yang, B., Zhang, P., Li, J., & Wang, T. (2023). Size Selectivity of a Diamond-Mesh Codend of Demersal Trawl for Largehead Hairtail (Trichiurus lepturus Linnaeus, 1758) in the Beibu Gulf, in the South China Sea. Journal of Marine Science and Engineering, 11(7), 1444. https://doi.org/10.3390/jmse11071444