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The fish-based index of biotic integrity (F-IBI) is widely used to assess river ecosystems. We have adapted modification and used Karr’s index of biotic integrity (IBI) and also literature for the running water, including 18 metrics in seven categories. With survey data from the Maetang River fishery resources in 2003 and 2019, fish diversity, fish status, habitat composition, tolerant, trophic composition, fish health and altitude distribution in the river’s Maetang River were examined. The fish data of this study consisting of 13 family and 32 species. These metrics were used in the final IBI, which ranged from 18 (worst) to 90 (best). The total Fish-IBI score of 53 was calculated, which ranked as fair level. This study will become a great reference for water resources management and ecosystem restoration in the running river.
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