Figure 3. Relative proportion of one-year-old individuals in
Lake Skrukkebukta (blue) and Lake Vaggatem (green) perch populations on
a natural logarithmic scale related to the preceding summer water
temperature (°C). Relative proportion of one-year-old perch is
calculated as the proportion of one-year-old individuals relative to the
total CPUE (100m2/12h)-1 in the
littoral zone of the two lakes.