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Effects of long-term thermal acclimation on muscle ultrastructure in teleost fish


Effects of long-term thermal acclimation on muscle ultrastructure in teleost fish



FASEB Journal 15(5): A813



ISSN/ISBN: 0892-6638

The time-course of ultrastructural change in oxidative myotomal muscle was quantified in goldfish, (Carassius auratus L.), acclimated to cold (5degreeC) temperature for short (8 week) and prolonged (32 week) regimes. Muscle structure was determined by stereological measurement of the cold acclimated fibers and comparison to similar measurements of warm acclimated fibers (25degreeC for 32 weeks). Fiber cross-sectional area increased by 31% in fish acclimated to cold temperature for 8 weeks (1263.3 +- 33.9 :m2), relative to the fiber cross sectional area of fish acclimated to warm temperature (962.1 +- 14.2 :m2). After 32 wk of cold acclimation, fiber cross-sectional area decreased 31% from the 8 wk value (875.7 +- 14.3 :m2). Volume density (Vv) of myofibrils decreased significantly from warm values (0.61 +- 0.08) in 8 wk cold (0.51 +- 0.07) and 32 wk cold (0.46 +- 0.002) fibers. Increases in mitochondrial Vv parallel the decrease in myofibril Vv in the cold fibers: (0.10 +- 0.03) warm, (0.15 +- 0.07) 8 wk cold, (0.23 +- 0.2) 32 wk cold. Subsarcolemmal mitochondrial populations did not change with cold acclimation, while intermyofibrillar mitochondrial Vv significantly increased in 32 wk cold (0.10 +- 0.03), (0.05 +- 0.02) 8 wk cold, (0.03 +- 0.02) warm. Capillary density of the tissue at 32 wk was 0.17 +- 0.02, increasing extracellular oxygen transport in cold acclimated fish above values in both the warm and 8wk cold fish (0.04 +- 0.01). During long-term thermal acclimation the condition factor of the fish remained constant in all temperature regime populations (mean 3.56 X 10-5gcntdotmm3). These data indicate that acclimation-induced changes in muscle ultrastructure are biphasic.

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