The fish species composition,dominant species,ecological groups,diversity and disturbance were ana-lyzed to explore the characteristics of fish community structure and diversity in urban lakes under the back-ground of eutrophication,the fish in three small lakes in the Hanyang region,namely Sanjiao Lake,Nantaizi Lake and Moshui Lake,were investigated seasonally in 2021-2022.A total of 24 fish species were collected from three lakes,belonging to 5 orders,6 families and 20 genera,among which Cyprinidae was the most,accounting for 75.0%of the total species.Non-metric multi-dimensional ranking analysis showed that the fish community structure of Sanjiao Lake and Nantaizi Lake was similar.Both of them were quite different from that of Moshui Lake,and the fish community structure of the three lakes had obvious seasonal changes.Toxabramis swinhonis were the first dominant species in the three lakes.There was no significant difference in species diversity index a-mong lakes.Shannon-Wiener diversity index(H),Margalef richness index(D)and Pielou evenness index(E)ranged from 1.3 to 1.4,1.6 to 1.9 and 0.5 to 0.6,respectively.The species diversity index was relatively high in summer or autumn.Pelagic,plankton-eating,sticky-egg-producing fish dominate the lakes.The comparison curve of abundance/biomass showed that the fish communities in Sanjiao Lake and Nantaizi Lake were greatly disturbed,and the degree of disturbance in Moshui Lake was relatively light.From the point of view of lake wa-ter quality protection,it was suggested that the fish community structure be regulated,populations of filter-feed-ing and carnivorous fish in the lake should be improved,and the downward control of algae should be en-hanced.
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