The Migration of Rutilus frissi kutum, Vimba vimba persa and Calcalburnus chalcoides to the Sefidrud River
A. Khaval
The Sefidrud river has always been the natural spawning site for many anadromous fish species, including sturgeon, kutum, Vimba vimba pers a and Calcalburnus chalcoides. Many factors such as marine constructions, removing sand and fine sand and pollution have reduced the productivity of the river, which have caused a decline in the migration of the. fishes to the river. Our study revealed that, despite the environmental pressure on the river, some fishes still migrate to the Sefidrud river. Besides sturgeon, bony fishes, which are highly valued at the market also migrate to the Sefidrud river. The spawning of kutum in the Sefidrud river peaked in the second half of March, when water temperature reached 11°C. By a regulatory management of the catch, this river is able to conserve the biological productivity of the southern Caspian Sea......
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