Fig. 3. Scatter plot with regression lines demonstrating the correlation of red muscle relative proportions (white-to-red ratio, w/r) with fish size as given by total muscle cross sectional area (c.s.a) in Danube bleak (Cc) reared under constant (thin black line) and changing (rising) thermal conditions (thick red and blue lines). Also shown, for comparison, are data for two further cyprinid species (roach, Rr; pearlfish, Rf) reared at various constant temperatures. Equations for Danube bleak: Cc 20 °C: y=2.824x+13.284 (r²=0.894, P<0.001); Cc 18-20 °C: y=1.6178x+8.9764 (r²=0.686, P<0.001); Cc 12-16 °C: y=1.6032x+8.7289 (r²=0.794, P<0.001).