Abstract
A thermally selected strain of rainbow trout has been established by selective breeding since 1966 in Miyazaki, Japan. In the present study, we compared the critical thermal maxima (CTMs), the temperatures at which organisms reach a predefined sublethal endpoint and lose their equilibrium, between a thermally selected and two normal (Donaldson) strains of rainbow trout. The CTM of one normal strain from Nikko (Nikko strain) acclimated to 20 °C (29.7 °C) was significantly lower than those of the thermally selected strain (30.0 °C) and the other Donaldson strain from Aomori (29.9 °C) (P < 0.05). The F1 generations, F1T and F1N, were produced by crossing thermally selected strain females with Nikko strain males and Nikko strain females with thermally selected strain males, respectively. No significant difference was observed in the CTM between F1T [30.1 ± 0.15 °C (n = 30)] and F1N [30.1 ± 0.16 °C (n = 30)] (P > 0.05) for fish acclimated to 20 °C, suggesting that the F1 offspring inherited the thermal tolerance trait from one thermally selected strain parent irrespective of whether it was the male or female. F2 offspring of F1T or F1N also showed the thermal tolerance trait. The coefficients of variation for CTM were also compared among all the datasets obtained in the present study and their values for F1 hybrids were lower than those of the parental generation of the Nikko strain (P < 0.05). In contrast, the coefficients of variation of F2s were the same as those of their parental generation. Furthermore, the thermally selected strain and Nikko strain as a reference family provide a F2 generation for segregating phenotypes, which is required for in-depth genetic analysis of the thermally selected rainbow trout strain.
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Acknowledgements
This study was supported in part by a grant from the Ministry of Agriculture, Forestry, and Fisheries of Japan. We are grateful to the researchers at Aomori Prefectural Industrial Technology Research Center, Freshwater Fisheries Research Institute, for providing the rainbow trout. We also thank Mr. T. Setoguma and Ms. Y. Yoshino of the Marine Ecology Research Institute Central Laboratory for rearing the rainbow trout.
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Ineno, T., Tamaki, K., Yamada, K. et al. Thermal tolerance of a thermally selected strain of rainbow trout Oncorhynchus mykiss and the pedigrees of its F1 and F2 generations indicated by their critical thermal maxima. Fish Sci 84, 671–679 (2018). https://doi.org/10.1007/s12562-018-1217-2
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DOI: https://doi.org/10.1007/s12562-018-1217-2