Abstract：In order to investigate the characteristics and diversity of the fish community in Yichun section of lower Ganjiang River, fish stock resources were surveyed in 5 sampling sites(Xiaogang, Yangliuhu, Quangang, Damatou and Yongtai) by gillnets with mesh size of 2—14 cm in Yichun section of lower Ganjiang River in July (summer) and November (winter) from 2023 to 2024. The results showed that a total of 60 fish species were identified in the four surveys, belonging to 7 orders, 12 families and 42 genera, with the major species in Cyprinidae in Cypriniformes (species proportion of 65% in total) and the dominant species Parabramis pekinensis and Xenocypris argentea. For ecological species, omnivore fishes and lower-middle fishes were found to be the main species. There was relatively high fish biodiversity in the Yichun section of lower Ganjiang River and the relatively stable diversity characteristic during the summer and autumn seasons. The cluster analysis revealed that the fish community from 2023 to 2024 was divided into four groups, one group in most of the sampling sites, one group at sampling site in Xiaogang in the autumn of 2023 and the autumn of 2024, and one independent group at sampling points of Damatou in the autumn of 2023 amd Xiaogang in the autumn of 2024. Abundance biomass curves (ABC) indicated that the fish community at Quangang was disturbed continuously during the survey period. It was found that the fish resources were abundant and the community was relatively stable in Yichun section of lower Ganjiang River. Water temperature and sand mining activities might be the main factors influencing fish diversity in Yichun section of lower Ganjiang River.
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2026, Vol. 45 
