Relationship between abundance of <i>Dosidicus gigas</i> and environment factors in the offshore waters of Peru based on random forest model

Peng Weitu; Chen Feng; Li Jianxiong; Zhao Yixiang; Dong Yijiang; Dai Qian; Xu Hanxiang; Zhu Wenbin

doi:10.12284/hyxb2024078

Volume 46 Issue 7

Jul. 2024

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Peng Weitu，Chen Feng，Li Jianxiong, et al. Relationship between abundance of Dosidicus gigas and environment factors in the offshore waters of Peru based on random forest model[J]. Haiyang Xuebao，2024, 46(7)：41–50 doi: 10.12284/hyxb2024078

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Peng Weitu，Chen Feng，Li Jianxiong, et al. Relationship between abundance of Dosidicus gigas and environment factors in the offshore waters of Peru based on random forest model[J]. Haiyang Xuebao，2024, 46(7)：41–50 doi: 10.12284/hyxb2024078

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Relationship between abundance of Dosidicus gigas and environment factors in the offshore waters of Peru based on random forest model

doi: 10.12284/hyxb2024078

Peng Weitu^{1, 2
,},
Chen Feng²,
Li Jianxiong^{1, 2},
Zhao Yixiang^{1, 2},
Dong Yijiang^{1, 2},
Dai Qian²,
Xu Hanxiang^{1, 2},
Zhu Wenbin^{2
,
,}

1.
Marine and Fishery Institute of Zhejiang Ocean University, Zhoushan 316021, China
2.
Zhejiang Marine Fisheries Research Institute/Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds, Ministry of Agriculture and Rural Affairs/Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resources of Zhejiang Province, Zhoushan 316021, China

Received Date: 2023-12-05
Rev Recd Date: 2024-04-01

Available Online: 2024-06-17

Publish Date: 2024-07-01

Abstract

Abstract

Dosidicus gigas is an oceanic economic fish in the offshore waters of Peru, and its abundance is greatly affected by environmental factors. This study obtained the abundance of D. gigas through fishing logs from September to December in 2018−2021, combined with environmental factors, including surface temperature (SST), sea surface salinity (SSS), sea surface height (SSH) and chlorophyll a concentration (Chl a) acquired from satellite remote sensing. Random forest model and ArcGIS were applied to analyze the correlations between the abundance of D. gigas and environmental factors. Results showed that the distribution of the center of gravity of fishing ground was concentrated in the range of 13°−21°S, 76°−87°W during 2018−2021, and the center of gravity shifted from northwest to the southeast from September to December. The results of random forest model analysis showed that, the impact of environmental factors on the abundance and distribution of D. gigas in the offshore waters of Peru varied among different months. The optimal SST ranged from 16.3℃ to 18.5℃, The optimal SSS ranged from 35.1 to 35.4, the optimal SSH ranged from 0.55 m to 0.60 m, the optimal Chla concentration ranged from 0.18 mg/m³ to 0.46 mg/m³. The predicted CPUE values derived from the random forest model were generally consistent with the nominal CPUE distribution, indicating the suitability of the random forest model for analyzing the relationship between D. gigas and environmental factors in the offshore waters of Peru. This study is of great significance for understanding the resource dynamics of D. gigas and guiding its production.
- Dosidicus gigas,
- random forest model,
- abundance,
- environmental factors

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References(37)

References

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