Reproductive biology of Gattan females Barbus xanthopterus (Heckel, 1843) used for artificial breeding in Fish Hatchery of Marine Science Center

Some aspects of reproductive biology Gattan Barbus xanthopterus females were studied from 15-30 March, 2009. These fishes coughed Huweiza Marsh, Southern Iraq and Therthar Reservoir, Western Iraq, used for artificial breeding in Marine Science Center Hatchery. Total lengths ranged between 550-806 mm, total weights 3100-7250 g, their age 3-6 years. It had been found that all examined ovaries ripe stage means cached Marsh ready possess suitable (3.64- 11.03) gonado somatic index (GSI), while collected Reservoir low GSI (1.15-1.33). Average eggs diameters was 1.56 mm fish 550 length 3400 it 2.09 802 7005 g. However, generally there positive relationship with no significant correlation (r = o.47, P<0.01). Absolute fecundity 1494191-518650 eggs, relative 85.8-286.2 egg/g, relation absolute weight (r= 0.33,