Author(s): Tayfun KarataÅŸ and Esat Mahmut Kocaman

Abstract: The aim of this study compared to effect on survival and growth rates of rainbow Trout Eggs of applied shocks in different temperatures. Throughout this study, four different temperatures (24, 26, 28 and 30⁰C) and a control group (9.6⁰C) were used.Eggs fertilized by milt of male fish were shocked for 7 minutes in four different water batches provided to 24±0.1⁰C, 26±0.l⁰C, 28±0.1⁰C and 30±0.1⁰C by aquarium heaters. The survival rates of eggs from fertilization to hatching were determined as 87.1% for control group (9.6⁰C), 86.6% for 24⁰C, 84.6% for 26⁰C and 80.1 for 28⁰C, and 76.3% for 30⁰C. The difference between groups was important as statistical (P<0.05).No significant differences between groups with regard to weight gain and feed conversion rates (FCR), specific growth rates (SGR) of fry at the end of the 120-days experiment were determined, but, the growth rate, FCR and SGR of fish shocked in 24⁰C were found to be higher than that of the other groups.Finally, the heat shock applied in 24⁰C could be important for the optimal development in rainbow trouts.

Pages: 571-573  |  1416 Views  158 Downloads

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