Analysis of scientific collaboration and hotspots in fish passage facilities at home and abroad

Fish passage facilities play a crucial role in maintaining aquatic ecological balance and protecting fish resources. Using CNKI and Web of Science as data sources, this study employs bibliometric methods to construct knowledge maps, aiming to systematically review and summarize the research status and frontier trends in this field. The findings are as follows: ① Research strengths in fish passage facilities are mainly concentrated in North America, Europe, and East Asia, with research institutions being primarily scientific research institutes and universities, and author collaboration exhibits obvious "institutional network" characteristics.② International research tends toward ecological integrity assessment and multi-species compatible fish passage facility design, while domestic research focuses on the protection of endemic migratory fish species in specific basins such as Southwest China and the middle and lower reaches of the Yangtze River, as well as the adaptability of fish passage facilities.③ Extensive practical explorations in structural design, hydraulic characteristics, and fish behavior have been conducted both domestically and internationally. Indoor hydraulics and fish behavior tests are widely used as foundational supporting technologies, but international research increasingly tends to integrate long-term ecological field monitoring data with fish behavior mechanisms, whereas domestic research places more emphasis on innovative applications of numerical simulation technologies.④ Current research hotspots are concentrated on exploring hydraulic characteristics through model tests and numerical simulations, and the research frontiers have extended to deep learning-assisted assessment and monitoring as well as fish behavioral response patterns under global climate change. Domestic research is gradually expanding from structural optimization to ecological effect assessment and watershed system governance.