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Fish Biodiversity were studied at 18 stations in Talar River (one of the major Caspian Sea sub basin) from 1997 to 2004. In this research, 33 species of 14 families were found in the area. Cyprinidae was the most diverse of all families. Diversity of resident fish were more than that of migratory one. Fish species diversity increased toward downstream.According to IUCN, the categories of fish species are:
1- Acipenser persicus, Acipenser stellatus and Salmo trutta fario: vulnerable (VU)
2- Esox lucius and Barbus capito: conservation dependent (cd)
3- Caspiomyzon wagneri, Barbus lacerta, Barbus mursa, Chalcalburnus chalcoides and Vimba vimba : near threatened (nt)
Most fish species of Talar River, are important in terms of sport fishing.