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Fig. 5. Theoretical reaction norms for myotube production in fast muscle at
different temperatures for (A) the embryonic and (B) the stratified
hyperplasia stages of myogenesis prior to hatching. (C) The total number of
fast muscle fibres per myotomal cross-section present at hatching at the
different temperatures. Two reaction norms are illustrated (open and filled
circles). In the situation illustrated by the open circles fast fibre number
at hatching is apparently independent of temperature, but this is a
consequences of the different reaction norms for embryonic and stratified
hyperplasia. The norm of reaction illustrated by the filled symbols shows a
temperature optimum for myotube production that differs somewhat for the two
phases of myogenesis. Note in this example that studying fish reared at just 4
and 12°C and sampled at hatch would result in the erroneous conclusion
that muscle fibre production was independent of temperature.
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