Fish surveys were conducted at 30 sampling stations, yielding at a total of 77 species belonging to 46 genera, 17 families and 9 orders. The Khwae Yai river basin contained 31 species representing 23 genera, 15 families, 8 orders. In contrast, the Moei river basin contained 54 species representing 42 genera, 14 families, and 8 orders.

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