Certain Aspects of the Reproductive Biology of Berzem ( Barbus pectoralis ) in Karoon River

摘要

This study was carried out from December 2007 to November 2008. From the total number of 352 specimens of caught fishes, 71 and 58 were males and females respectively and 223 specimens were immature. Length range was 945-200 mm. Morphological studies of the gonads revealed the existence seven maturity stages in B. pectoralis while gonadosomatic index (GSI) indicated that the breeding time extended from January to February. The species determined as a total spawner and eggs are release in shallow waters on gravel bottoms (Shoushtar Station). Results indicated that the age of maturation of male is less (3 years) than female (4 years). LM50 = 35-40 cm in males and 50-55 cm in females. Absolute fecundity ranged from 7144 to 332196 and relative fecundity varied between 3845 to 164753 per Kg. Highest ova diameter was 2 mm (February). Sex ratio was 1:2 (male/female). Correlation of body weight and total length was high and determined (R = 0.95), total length and age was (R = 0.77), total length and absolute fecundity was (R = 0.64).