Brook trout were last stocked in Dislocation Lake in 1989. Survival from that and previous stockings had been poor, so stream trout management was discontinued. Competition from large numbers of yellow perch and white sucker was thought to have been the likely cause of poor trout survival. The presence of brook trout in 2010 was unexpected. They might have been naturally produced in the lake inlets or outlet. Or, they might have migrated into the lake from Fiddle Creek, which has a natural brook trout population and which receives the outlet flow from Dislocation Lake.
The brook trout catch matched the median catch for May-June gill net assessments of stocked stream trout lakes in the Grand Marais Area. Mean weight exceeded the area median of 0.63 lb/fish. Growth rates of the five two-year-old and one four-year-old fish matched averages for the area. Growth of the eight three-year-old brook trout collected had been slightly slower than the average for the area.
The yellow perch catch has fluctuated widely in assessments. The 2010 catch was in the mid-range for the lake class, and was much lower than the catch had been in some years.
White sucker catches have also fluctuated considerably, but have always been above average for the lake class.
There are currently no plans to resume trout stocking, and in any case, stocking is not needed at this time. Future stocking would likely fail again if the yellow perch population increased greatly. It is not feasible to exterminate the yellow perch and white sucker in this lake and reclaim it for trout management.