تركيب جنسيت فيل ماهي HUSOHUSO در سواحل جنوبي درياي خزر

Sex composition of Beluga (Huso huso Linnaeus, 1754) along the Iranian coastal waters, Caspian Sea

Beluga Huso huso is commercially an important species of sturgeon fish in the Caspian Sea. We determined the sex ratio of the commerciaJ catch of the fish along the Iran coastal waters of the Caspian Sea during the years 199Q..2003. Females dominated the catch and composed between 60-80010 of the landed fish. Observations on gonads maturity showed that immature femaJes decreased from 71% to 47%of total catch.Femalefish ratio increased from west to eastin the coastalwaters.