Thermal tolerance of a rainbow trout <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> strain selected by high-temperature breeding |
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| Authors: | Email author" target="_blank">Toshinao?InenoEmail author Shuji?Tsuchida Mikio?Kanda Shugo?Watabe |
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| Institution: | Miyazaki Prefectural Fisheries Experimental Station Kobayashi Branch, Kobayashi, Miyazaki 886-0005,;Marine Ecology Research Institute Central Laboratory, Onjuku, Chiba 299-5105,;Miyazaki Prefectural Fisheries Experimental Station, Miyazaki 889-2162 and;Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan |
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| Abstract: | ABSTRACT: Thermal tolerance was studied in a rainbow trout strain successively selected through high temperature breeding at 20–27°C since 1966 in Miyazaki Prefecture, Japan. The hatching rate and fry mortality at high temperatures were examined in the selected strain along with normal strains cultured at water temperature of 9–17°C. The hatching rate of embryos fertilized at either 10 or 14°C and subsequently subjected to high temperatures in the blastula or neurula stage of the selected strain, was marginally higher than that of the normal strain counterparts. The upper 50% lethal temperatures (LT50) for embryos in the early segmentation, blastula and neurula stages of the selected strain were also higher than those of the normal strain counterparts. Death temperatures and LT50 of fries acclimated to 20°C of the selected strain were significantly higher than those of the normal strains. However, no difference in the critical thermal maximum was detected between the different strains. These results suggest that the selected strain of rainbow trout established by selecting successively for many generations at high temperatures acquired a degree of thermal tolerance. |
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| Keywords: | embryonic development high temperature breeding upper 50% lethal temperatures Oncorhynchus mykiss rainbow trout thermal tolerance |
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