Identifying conservation strategy is essential regarding prioritization, planning, and managing biodiversity. The Eastern Himalayan freshwater reaches contain diverse taxa of fish species. Despite having several coarse scales of assessment, the information regarding the fine-scale conservation priorities is scanty. The development of indices from multimeric attributes has been proved efficient, aiding conservation planning, in-depth research, exploitation, policy-making, and public awareness. Therefore, this study aims to provide detailed indexing of conservation values for the freshwater fish species inhabiting the sub-Himalayan Terai–Dooars ecoregion of the Eastern Himalayas. Based on three years of extended sampling in six freshwater reaches, 170 indigenous fish species were identified. Each fish species was assigned a discrete conservation value following their rarity, taxonomic singularity, contribution to β diversity, global threat status, regional importance, and maximal achievable body lengths. Neolissochilus hexagonolepis has the highest conservation value. In contrast, the lowest values were observed for Pethia gelius, Pethia guganio, and Pethia phutunio. The freshwater habitats of upper and lower elevation harbor essential fish species for conservation, driven by precipitation, topographic, and land cover variability. Such results were accomplished through spatial interpolation and prioritization regarding fish conservation, protection, and vulnerability toward the human footprint for this region of the Eastern Himalayas.

确定保护策略对于确定优先次序、规划和管理生物多样性至关重要。东喜马拉雅淡水河段包含多种鱼类。尽管有几个粗略的评估规模，但有关精细保护优先事项的信息很少。事实证明，从多属性开发指数是有效的，有助于保护规划、深入研究、开发、政策制定和公众意识。因此，本研究旨在为栖息在东喜马拉雅山脉的次喜马拉雅 Terai-Dooars 生态区的淡水鱼类物种的保护价值提供详细的索引。根据对六个淡水河段的三年扩展采样，确定了 170 种本地鱼类。Neolissochilus hexagonolepis具有最高的保护价值。相比之下，Pethia gelius、Pethia guganio和Pethia phutunio的值最低。在降水、地形和土地覆盖变化的驱动下，高海拔和低海拔的淡水栖息地拥有需要保护的重要鱼类物种。这些结果是通过空间插值和对东喜马拉雅山这一地区的鱼类保护、保护和对人类足迹的脆弱性进行优先排序来实现的。