Fish were sampled in May, June, and August 2011 in
all major lake habitats (littoral, pelagic and profundal)
using multipaneled gillnets with mesh sizes from 5 to
55 mm. Bottom gillnets (30 9 1.5 m) were set in the littoral
zone (0–15 m) and at three different depths of the
profundal zone (25, 35 and 45 m), and floating nets
(40 9 6 m) were set in the pelagic zone. Gillnets were set
in the afternoon and collected in the next morning. For
more details of the fish sampling, see Smalas et al. (2013).
During field sampling, the temperature in the littoral/
pelagic zone (1 m depth) ranged from 3.5°C in May (full
spring circulation) to 12.0 and 13.3°C in June and
August, respectively. In the profundal zone (≥20 m
depth), the temperature was 7.0°C in both June and
August. The Secchi depth was measured to be 16.5 m in
May and 14.5 m in June and August.