Clonorchiasis poses a great threat to human public health. Clonorchis sinensis (Opisthorchiidae: Digenea) is the most representative fish-borne parasitic zoonotic agent. As the second intermediate host of C. sinensis, fish are necessary for C. sinensis to complete its life cycle and infect humans. This study was the first to explore the selectivity for the second intermediate host of C. sinensis from the fish ecological viewpoint. A total of 162 fish species were found in the Jialing River basin, and 46 fish species were confirmed to be the host of C. sinensis. Cyprinidae fish, which are frequently infected by C. sinensis, are distributed worldwide; thus, this selection strategy may play an important role in the wide spread of C. sinensis. Correlation analysis demonstrated that fish distributed downstream or those that inhabit the middle water layer were more likely to be the host species of C. sinensis. Additionally, we inferred that a fish species with broad activity space has a high possibility of becoming a host of C. sinensis. No direct relationship was found between host percentage and the average trophic levels of each trophic guild. However, host percentage may be correlated with feeding behavior. In general, these results can help humans in reducing the prevalence and infection range of clonorchiasis.

支气管扩张对人类公共健康构成巨大威胁。中华支睾吸虫（Operisthorchiidae：Digenea）是最具代表性的鱼源性寄生虫人畜共患病病原体。鱼是中华sin的第二个中间寄主，它是中华complete完成其生命周期并感染人类所必需的。这项研究是第一个从鱼类生态学角度探讨中华C第二中间宿主的选择性的研究。嘉陵江流域共发现鱼类162种，其中46种被确认为中华绒螯蟹的寄主。经常被中华fish感染的鲤科鱼类，分布在世界各地；因此，这种选择策略可能在中华绒螯蟹的广泛传播中发挥重要作用。相关分析表明，分布在下游的鱼类或栖息在中层水域的鱼类更有可能是中华锦鲤的宿主物种。此外，我们推断具有广泛活动空间的鱼类极有可能成为中华绒螯蟹的宿主。在寄主百分比和每个营养协会的平均营养水平之间未发现直接关系。但是，寄主百分比可能与进食行为相关。通常，这些结果可以帮助人类减少支气管扩张的患病率和感染范围。