This study was carried out from 2001 to 2002 in Gamasyab River of Hamadan province of Iran in order toidentification of indigenous species of this water resource. The main objective of this study was to fish identification for scientific purposes, geographical distribution pattern, preparation atlas of the fishes, introduction of commercial species and awareness on ecological situation of their natural habitats. Also providing necessary information for conservation and sustainable use of these valuable stocks and minimizing environmental impacts of unsecured utilization. Sampling were carried out by selecting 15 sampling stations through the river and fishing by electro fisher and cast net. Identification accomplished by valid identification keys in species level. Photography and slides provides and 10 pieces of each species tagged by unique codes for preservation in national museum. 50 morphometric and meristic characteristics studied for scientific identification.. Indigenous fishes belong to 14 species, 10 genus, 3 family and 2 order. Indeed 2 exotic species belong to Cyprinidae and Salmonidae families recognized. From these indigenous species, 11 belong to Cyprinidae family and only one species belong to Sisoridae family.

Iranian Fisheries Science Research Institute

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