A First Record of the Bittrling Rhodeus amarus (Bloch, 1782) (Cypriniformes, Cyprinidae) in the Iranian Part of Tigris-Euphrates Basin

ABSTRACT: The Bitterling (Rhodeus amarus) is reported for the first time from the Iranian part of Tigris-Euphrates basin. Previously, this species is reported in Caspian Sea Basin. In this report, a total of 7 Specimens from a treebutary of upper Tigris-Euphrates Basin, Ghare-sou River (Kermanshah province, Iran) were caught by an Electro-fishing. Morphological characteristics were examined and then compared with those reported in previous studies.