【摘要】 綦江河是长江一级支流，源于贵州省桐梓县北大娄山系，在重庆市江津区汇入长江。20世纪40年代以来，綦江河被9座闸坝分隔为10个河段。为了解渠化对綦江河鱼类的影响，2023年对綦江河10个河段进行了5次鱼类调查，共获得渔获物3 383尾，总质量为317 414.09 g,隶属于3目7科40属52种，对获得的数据进行优势种、鱼类多样性、鱼类群落结构相似性、 ABC曲线分析，研究显示：綦江河全河段优势种为张氏■(Hemiculter tchangi)、斑点蛇鮈(Saurogobio punctatus)、中华倒刺鲃(Spinibarbus sinensis);长江口—五福(S1)河段的鱼类多样性在这10个河段中最高；有40%的采样点间的群落结构相似程度为中等相似，60%的采样点间的群落结构相似程度为中等不相似；ABC曲线分析表示，仅有1个河段未受干扰，其余河段均受到不同程度的外界环境因素干扰。与綦江河的历史资料对比结果表明，梯级闸坝对杂食性鱼类和底层鱼类有明显的阻隔效应，10个河段的鱼类群落结构差异较为明显。更多还原

【Abstract】 The Qijiang River is a first-level tributary of the Yangtze River, originating from the Beidagui Mountain Range in Tongzi County, Guizhou Province, and merging into the Yangtze River in Jiangjin District, Chongqing City. Since the 1940s, the Qijiang River has been divided into 10 sections by nine dams. To understand the impact of channelization on fish in the Qijiang River, five fish surveys were conducted in the 10 sections of the Qijiang River in 2023. A total of 3 383 fishes were caught, with a total weight of 317, 414.09 grams, belonging to 52 species, 40 genera, 7 families and 3 orders. The obtained data were analyzed for dominant species, fish diversity, similarity of fish community structure, and ABC curves. The study shows that the dominant species in the entire Qijiang River were Hemiculter tchangi, Saurogobio punctatus and Spinibarbus sinensis. The fish diversity in the section of Yangtze River estuary to Wufu(S1) was the highest among the ten sections. The degree of community structure similarity between 40% sampling points was moderately similar, and between 60% sampling points was moderately dissimilar. ABC curve analysis indicates that only one river sections remained undisturbed, while the rest of sections were affected by external environmental factors to varying degrees. The results of comparison with the historical data of the Qijiang River show that the cascade dams have a significant blocking effect on omnivorous and bottom-dwelling fish. This study found that the fish community structures of the 10 river sections are quite different.更多还原