Compared with the studies in the other rivers in Nan such as Haeng, Mang, Yao and Kon, the number of species in the two protected areas is similar. For examples, Lothongkham et al., 2009 found 45 species in the Haeng River, Lothongkham and Kullama, 2011 found 59 species in Yao river, and Lothongkham et al., 2013 reported 52 species in Kon river.