Temperature and oxygen tension influence the development of muscle cellularity in embryonic rainbow trout |
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Authors: | T W Matschak T Hhopcroft P Smason A R Crook N C Stickland |
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Institution: | Department of Veterinary Basic Sciences, The Royal Veterinary College, University of London, U.K. |
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Abstract: | Muscle cellularity at a developmental stage around the time of hatching was examined in rainbow trout which had been reared from the eyed stage at three different temperature regimes (5, 10 and 15° C) and different O2 tensions 70% of air saturation value (ASV) at 5° C, 100% of ASV at all temperatures, and 150% of ASV at 10 and 15° C]. It was found that, as has been shown for other species, there was a difference in muscle fibre numbers and fibre cross-sectional areas between some of the regimes. There was a decrease in fibre number at the intermediate and higher temperature, and a decrease in fibre size at the high temperature. The temperature effects observed were modified by the applied changes in O2 tension. An increased O2 tension at 10° C led to an increase in fibre size whereas a decrease in O2 tension at the low temperature resulted in a decrease in fibre number. The largest total white muscle cross-sectional area was achieved at 10° C under high O2 conditions. Temperature and O2 tension therefore had a clear effect on muscle cellularity and there was a significant interaction between the two parameters. |
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Keywords: | rainbow trout white muscle morphometry development fish embryo |
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