Community Structure Characteristics and Changes in Fish Species at Poyang Lake after the Yangtze River Fishing Ban

文献类型： 外文期刊

第一作者： Zhang, Yanping

作者： Zhang, Yanping;Zhang, Haixin;Wu, Zijun;Feng, Guangpeng;Zhao, Mingguang;Feng, Guangpeng

作者机构：

关键词： Poyang Lake; fish resources; Yangtze River fishing ban

期刊名称：FISHES （ 影响因子：2.1； 五年影响因子：2.4 ）

ISSN：

年卷期： 2024 年 9 卷 7 期

页码：

收录情况： SCI

摘要： To understand the fish community structure characteristics and changes in Poyang Lake after the Yangtze River fishing ban in 2021, seven sampling stations were established, namely in Hukou, Lushan, Duchang, Yongxiu, Nanjishan, Ruihong, and Poyang, for fishery resource surveys between 2020 and 2021. The results showed that 93 fish species were identified, belonging to 11 orders, 20 families, and 61 genera, which was an increase of 4.5% from before the fishing ban. Of these, 52 Cyprinidae species were identified, comprising the highest proportion (55.91%). Four invasive alien species (hybrid sturgeon, Cirrhina mrigala, Piaractus brachypomus, and Mugil cephalus) were identified, and the number of alien species in Poyang Lake was higher than before the fishing ban. Carnivorous and mid-lower-level fish showed a significant increase, accounting for 47.31% and 38.71% of the total species, respectively. Compared with the Yangtze River before the fishing ban, the body length and body weight of the main economic fish in Poyang Lake increased by 6.10-61.26% and by 15.14-291.57%, respectively. In terms of age structure, the proportion of major economically important fish aged 1 or 2 years decreased significantly, while the proportion of older fish increased substantially. There was little difference in the diversity of fish communities at different stations in Poyang Lake. In terms of biodiversity, the Shannon-Wiener index ranged from 2.158 to 2.909, with Poyang having the highest value and Nanjishan the lowest. Margalef's index ranged from 4.265 to 6.459, with Lushan having the highest value and Nanjishan the lowest. Pielou's index ranged from 0.617 to 0.822, with Duchang having the highest value and Nanjishan the lowest. Hence, the Yangtze river fishing ban has played an important and positive role in the restoration of fishery resources in Poyang Lake. However, long-term tracking and monitoring are needed to provide information to comprehensively evaluate the ecological impact of the Poyang Lake fishing ban.

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