Figure 4. Back-calculated length increment
(mm·year-1) for age 1 year (top left), 2 years (top
right), 3 years (bottom left) and 4 years (bottom right) perch from Lake
Vaggatem (green) and Lake Skrukkebukta (blue) in the Pasvik watercourse
dependent on summer water temperature (°C). Points represent the mean,
whiskers represent the bootstrapped 95 % confidence interval of the
mean, trend line with shading represent linear regression with standard
error.