Study of growth and reproductive characteristics of the female fish, Capoeta damascina, in Sezar River, Speiddasht, Lorestan Province

. In this survey length-weight relationships, gonadosomatic index (GSI) and histological characters of gonad were investigated in female fish Capoeta damascina. For doing that, sampling was performed monthly from Sezar River in vicinity of Sepiddasht town, lorestan during nine months from October 2012 to June 2013. After sampling the specimens were transferred to a laboratory where biometric measurements were first executed. Later, the gonads were dissected and after measuring dimensions they were processed for histological examinations. Data obtained from biometric assays demonstrated that a negative allometic growth pattern observed in this species. Moreover, the greatest value of GSI is seen in May. In addition, histological surveys showed that the ovary is saccular and six distinct stages can be distinguished during development of oocytes. Results provided here indicated that during the autumn and the winter the oocytes grow and differentiate whereas the spring, specifically May, is the phase of short-time spawning.