No active fish management is conducted on Kohlman Lake due to the lack of a public access. The lake is connected to Gervais Lake by a navigable channel with no barriers to fish movement. Although the sample size was small, Walleye were captured above the median level for abundance. Three of the Walleyes captured were yearlings that had been stocked in Gervais Lake during Fall 2004. The other Walleyes captured were 7 and 9 year-old adults that were over 25.0" in length, with the largest individual measuring 27.56 inches. One Hybrid Muskie was captured that measured 28.15" and weighed 4.4 pounds. The condition and growth rate of this fish was below average. No Northern Pike were captured during this survey. Bluegill were captured in the highest abundance of all species in this survey. The average size of sampled Bluegill was 5.75" long and 0.13 pounds, with 1.2% of all fish captured being 7.0 inches or longer. Black Crappie were sampled within the normal range for abundance, but the average size was only 6.67" long and 0.18 pounds. Growth rates for Bluegill and Black Crappie are average. Largemouth Bass were sampled near median levels of abundance with the largest individual measuring 19.57 inches in length.
- Eurasian Watermilfoil
Recreational activities such as recreational boating, angling, waterfowl hunting, and diving may spread aquatic invasive species. Some aquatic invasive species can attach to boats, while others can become tangled on propellers, anchor lines, or boat trailers. Many species can survive in bilge water, ballast tanks, and motors or may hide in dirt or sand that clings to nets, buckets, anchors, and waders. Fortunately, completing simple steps can prevent the transport of aquatic invasive species.