Examine The Fecundity and Egg quality Connected to Biometrical Parameters of Female broad stocks of Rainbow Trout (Oncorhynchus mykiss) A case study in cold water fish reproduction center (shahid motahari in yasuj)

In order to examine the fecundity and egg quality connected to biometrical parameters of female broad stocks of rainbow trout (Oncorhynchus mykiss) a case study in cold water fish reproduction center (shahid motahari in yasuj) was done. In this study broad stocks were 2-7 years and 0/78-3/02kg weight. Sampling was done in 3 times and in each time 27 broad stocks were examined. Length, weight, total fecundity egg size and egg diameter of each broad stock were measured. The relation between length, weight and age of broad stocks with fecundity, ova and egg quality was applied by Microsoft SPSS Version 14. Results showed a direct relation between broad stocks age, length and weight with relative fecundity (P<0/05). There was a meaningless relation between age of broad stocks with relative fecundity and also age, length and weight of broad stocks with egg diameter. Based on this study, with increasing the weight and length of broad stocks, total fecundity was increased and relative fecundity was decreased. Average of relative fecundity in elder broad stocks decreased. Our study showed that broad stocks with 40cm length and weight of 1-1/5kg are better than other broad stocks for reproduction.