Status of the fish fauna in the South Caspian Basin of Iran

80 taxa of fish have been recorded in the Iranian South Caspian Basin (both inland and coastal waters), belonging to 17 families and 53 genera. The two most diverse families are Cyprinidae with 39.7% of all species, followed by Gobiidae with 13.2%. Seven families have only one genus and one species. Alien species with a wide distribution range contribute 18.7% of the total number of fish species. All species were classified according to their IUCN Red List Categories: four species are critically endangered, seven vulnerable, seven conservation dependent, seven near threatened, and 24 least concern species.