Summary
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1.
Parameters of the isometric twitch were measured for the pectoral fin adductor muscles of goldfishCarassius auratus acclimated to 10°C or 28°C. Contractile parameters and myofibrillar ATPase activities were measured at a range of temperatures. The muscle fibre composition was measured for transverse sections of pectoral fin adductor muscles from goldfish acclimated to 10°C or 28°C.
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2.
Cold acclimation was associated with an increase in the proportion of oxidative fibre types. Muscles from cold acclimated fish had an average of 23% more red and pink fibres than muscles from warm acclimated fish.
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3.
Cold acclimated fin muscles also possessed a significantly higher myofibrillar ATPase activity than warm acclimated fin muscles. This difference was greatest at lower measurement temperatures.
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4.
Muscles from cold acclimated fish were able to maintain quicker rates of contraction and relaxation at low environmental temperatures, as shown by the possession of significantly shorter response times.
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5.
The temperature dependence (Q10) of the isometric twitch contratile parameters for fin muscle from warm or cold acclimated goldfish was similar over the temperature range 20–30°C. However, over the temperature range 6–15°C fin muscles from warm acclimated goldfish possessed consistently higher Q10's.
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Abbreviations
- SDH:
-
Succinic dehydrogenase
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Heap, S.P., Watt, P.W. & Goldspink, G. Contractile properties of goldfish fin muscles following temperature acclimation. J Comp Physiol B 157, 219–225 (1987). https://doi.org/10.1007/BF00692366
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DOI: https://doi.org/10.1007/BF00692366