From the Minnesota DNR:
Lake Andrusia, in southeastern Beltrami County, is connected by the Mississippi River to the Cass Lake chain, and fish populations are influenced by movement between the lakes.
Primary fish species in Lake Andrusia are walleye, nothern pike, and yellow perch.
Muskellunge are also present but no special assessment targeting them has been conducted. All of the species making up the fish community are maintained through natural reproduction. Walleye fry are stocked only during years when the Big Lake Creek DNR walleye trap is operated.
A portion of the eggs taken are returned to the lake as fry. Large stands of bulrush serve as spawning and nursery areas for many aquatic organisms (including fish), and care is taken to protect all in-lake habitat to ensure continued successful reproduction.
Walleye were sampled in 1999 near the all time high catch rate for this lake. This catch rate was also higher than average for similar lakes in this area. Most walleye sampled were between 12.0 and 16.0 inches. The largest walleye sampled in this assessment was 26.5 inches. Average weight was 1.1 pounds; similar to all previous assessments.
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