Assessing the impacts of fishing on fish community in marine ranch of the Wuzhizhou Island based on size-spectrum model

Qiao Jiale; Li Xiaodong; Li Jianlong; Xia Kaiming; Liu Qi; Wang Yingbin

doi:10.12284/hyxb2024020

Volume 46 Issue 1

Jan. 2024

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Qiao Jiale，Li Xiaodong，Li Jianlong, et al. Assessing the impacts of fishing on fish community in marine ranch of the Wuzhizhou Island based on size-spectrum model[J]. Haiyang Xuebao，2024, 46(1)：64–76 doi: 10.12284/hyxb2024020

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Assessing the impacts of fishing on fish community in marine ranch of the Wuzhizhou Island based on size-spectrum model

doi: 10.12284/hyxb2024020

1.
School of Fishery, Zhejiang Ocean University, Zhoushan 316022, China
2.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
3.
Department of Marine Sciences, Hainan University, Haikou 570228, China
4.
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China

Received Date: 2023-08-17
Rev Recd Date: 2023-10-23

Available Online: 2023-10-31

Publish Date: 2024-01-01

Abstract

Abstract

The concept of ecosystem-based fisheries management has been widely recognized, but it’s application in the construction of marine ranch is still very rare. In this study, based on the data from a bottom trawl survey of fishery resources conducted in the waters of Wuzhizhou Island from 2020 to 2021, a marine ranch fish community size-spectrum model (SSM) was built, which reflects the complex structure of food webs and interspecies interactions in marine ranch, to assess the impacts of fishing on the fish community in marine ranch. The study analyzed the effects of changes in species-specific fishing death coefficient on fish community by simulating two management strategies (single-species management and multispecies management) and monitored the state of fish community characteristics using five community ecological indicators: the total biomass of the community, the slope of size spectrum, the mean maximum weight, the mean weight, and the large fish index. The results of the single-species management strategy showed that the marine ranch ecosystem of Wuzhizhou Island showed top-down control, and there was a strong regulatory effect of carnivorous fish on plankton-feeding fish. Complex interactions such as competitive predation among different species produce trophic cascade effects after changes in fishing death coefficient. The results of the multispecies management strategy showed that fishing death coefficient of Muraenesox cinereus had the greatest effect on the slope of size spectrum, and that fishing death coefficient of Trachiocephalus myops and Muraenesox cinereus had the greatest effect on fish community biomass and community structure and function. The results of this study have important implications for the conservation and stabilization of fish community, and can help managers to better understand the potential impacts of changes in fishing death coefficient rates on fish communities, so that viable and effective conservation and management strategies can be developed based on the importance of the species to the fishery.
- size-spectrum model,
- marine ranch,
- management strategies,
- ecological indicators,
- trophic cascading effects

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References(52)

References

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