Artificial Propagation of Gattan (Barbus xanthopterus Heckel) in Basrah- Iraq

Gattan (Barbus xanthopterus Heckel) was artificially propagated in marine science center fish hatchery- University of Basrah, During Spring 2009. The brooders were collected from Al-Huwaizah Marsh (which bring to the hatchery directly) and Al-Therthar reservoir reared earthen ponds). efforts collect Al- Kut dam failed, because water shortage. ranged between 1500-6500 gr weight II-V year age. gonads Huwaizah marsh good maturity stage, GSI 3.66-11.03%, ripe while brooder's developing with 1.1-1.3 %, this result agreed previous studies. "Aquacalm" substance used for sedation; it found that best concentration sedation 1 ppm. treatment induced spawning Carp pituitary gland extract (CPG), a dosage 6 mg/ kg, two injections, each 3 mg/kg, 12 h interval. Two fishes Therthar responding treatment, 1750 1500g. 350 g quality eggs obtained first fish. All males give small quantity milt added without mixing. Then covered for. Fertilization rate 88%. fertilized washed only, rearing tank 20min. incubated Zoug jars off 70 / jar, incubation temperature 22- 24°C. hatching completed after 72 h, 80 % rate. larvae start feeding three days; reached 5.3 ± 0.80 during ten days. floating cages. daily growth 1.94 mg 21 days rearing. period 48 23 mm length.