Fig. 5. (A) Red muscle temperature (Trm) of Fish 241
(calculated from the measured sensor temperature) as a function of ambient
temperature (Ta) during one day. The data points are
joined to illustrate the behavior of the fish and how this affects its
Trm. (B) The distribution of calculated
Trm for an ambient temperature interval of
10.0–25.5°C. (C) Density plot of the number of observations (i.e.
the number of observations per °C2) of a given combination of
ambient and calculated red muscle temperature. This plot is based on the
combined set of observations (all days and nights for the entire time of
deployment) for Fish 241, Fish 290, Fish 292, Fish 301 and Fish 625, for a
total of 921,592 observations. The dotted straight lines in A and C show
Ta=Trm.