The
Caspian kutum (
Rutilus kutum) or
Caspian White Fish is a member of the family
Cyprinidae from
brackish water habitats of the
Caspian Sea and from its freshwater tributaries. It is typically a medium-sized fish, reaching 45–55 cm in length, rarely 70 cm, and weighing up to 4.00 kg, rarely 5.00 kg. It used to be very common and was harvested commercially. The population seems to have collapsed due to
overfishing and
marine pollution. Its flesh and
roe are enjoyed as food, and highly prized in the
Gilan and
Mazandaran provinces in
Iran.