Comparison of survival and growth rates of diploid browntrout eggs after applied temperature shocks

In this study, we compared to survival and growth rates of brown trout eggs afterhocks at different temperature. In this study, four temperatures and a control group were used. Eggs fertilized by milt of male fish were shocked for 7 minutes in the batches provided to 24±0.1˚C, 26±0.l˚C, 28±0.1˚C and 30±0.1˚C by aquarium heaters. The survival rates of eggs from fertilization to hatching were determined as 81,7% for the control group (9.6˚C), 72,5% for 24˚C, 70,1% for 26˚C and 39,7% for 28˚C, and 29,8% for 30˚C. The difference between groups was statistically significant (P<0.05). All of groups applied heat shocks were 100% diploid. No significant differences between groups with regard to weight gain (WG) and feed conversion rates (FCR), specific growth rates (SGR) of fry at the end of the 150-days experiment were determined. However, WG, FCR and SGR rates of fish shocked in 26˚C were found to be higher than that the other groups (P˃0.05). Finally, the heat shock applied in 26˚C may be important for the optimal development in brown trout.