Comparison of hatching, deformity, survival rates, growth indicators and body composition between all-female rainbow trout’s (Oncorhynchus mykiss) through Gynogenesis by use of gamma irradiation

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    Gamma radiation at doses 450, 600, 750, 900 and 1050 Gry were used. Also, early thermal shock to induce diploid was used at 28°C. Hatching, deformity and survival rates were measured after developing period in different groups. Growth performance and chemical body analysis in fish were measured at the end of trail. Histological studies on the gonads were undertaken to demonstrate the success of gynogenesis induction. The highest and the lowest hatching and survival were obtained in the triploid group (p<0.05). No significant difference was observed in survival and deformity among irradiated treatments. Treatment irradiated with 450 gray showed the highest percentage of hatching (p<0.05). Growth indices showed a significance increase in gynogen groups compared to control and triploid groups (p<0.05).  There was no significant difference between chemical compositions (protein, fat, ash and dry matter) among different treatments.  The gonads histology demonstrated a successful in gynogenesis using gamma radiation. According to these findings it can be concluded that the use of gynogenesis by gamma ray in rainbow trout is a suitable method for increasing the production.

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