Resource Status of Coilia nasus in Poyang Lake and Preliminary Estimation of Its Environmental Capacity Under Extremely Low Water Level

WU Bin; ZHANG Haixin; WU Zijun; YU Jianfang; QUE Xiangyao; HOU Mingyong; ZHANG Yanping

doi:10.11924/j.issn.1000-6850.casb2024-0777

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Chin Agric Sci Bull ›› 2025, Vol. 41 ›› Issue (23) : 155-164. DOI: 10.11924/j.issn.1000-6850.casb2024-0777

Resource Status of Coilia nasus in Poyang Lake and Preliminary Estimation of Its Environmental Capacity Under Extremely Low Water Level

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Abstract

In order to conduct a dynamic analysis of the fishery resources in Poyang Lake, a study on the resource status of Coilia nasus and its environmental carrying capacity under extreme low water levels was carried out. Based on the fishery resource survey data, the length-based Bayesian biomass estimation method was used to obtain the relevant parameters of Coilia nasus population, and the Ecopath model was applied to estimate its environmental carrying capacity under extreme low water levels. The results showed that the average L∞ of Coilia nasus in Poyang Lake was 374 (368-381) mm; the resource status index E (F/Z) was 0.067, far less than 0.5; the ratio of current biomass to original biomass (B/B0) was 0.89 (0.225-2.6), which was greater than 0.5; from 2018 to 2022, L∞ and B/B0 showed an upward trend, while the ratio of fishing mortality to natural mortality (F/M) showed a downward trend, indicating that the resources of Coilia nasus showed a recovery trend after the fishing ban. The Ecopath model revealed that environmental carrying capacity of Coilia nasus in Poyang Lake was 5.03 t/km² (approximately 1136.78 t), while its current biomass was 2.83 t/km² (approximately 639.58 t). Currently, the overall resources of Coilia nasus in Poyang Lake are in an undeveloped state. The environmental carrying capacity has restricted the population growth of Coilia nasus to a certain extent, but there is still a large growth space for its population. The results of this study provide a scientific basis for the sustainable management of Coilia nasus resources and the protection of the entire lake ecosystem in Poyang Lake.

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Coilia nasus / fisheries resources / extremely low water level / environmental capacity / Poyang Lake

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WU Bin , ZHANG Haixin , WU Zijun , et al . Resource Status of Coilia nasus in Poyang Lake and Preliminary Estimation of Its Environmental Capacity Under Extremely Low Water Level[J]. Chinese Agricultural Science Bulletin. 2025, 41(23): 155-164 https://doi.org/10.11924/j.issn.1000-6850.casb2024-0777

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