Skogsfjordvatn (69.95°N, 19.17°E) is a deep (maximum
depth 100 m), oligotrophic dimictic lake in northern Norway,
with a surface area of 13.6 km2
. The lake is situated
20 m a.s.l. close to the ocean (1 km distance) and was
originally a marine fjord (Bratrein 1989). The drainage
area varies from high alpine landscapes to lowlands dominated
by birch forest, marches, and heather. The present
fish community consists of both anadromous and resident
populations of Arctic charr and brown trout (Salmo trutta),
anadromous Atlantic salmon (S. salar), three-spined
stickleback (Gasterosteus aculeatus), and occasionally
catadromous European eel (Anguilla anguilla).