Calhoun is a 401-acre lake located in south Minneapolis that is primarily managed as a Muskellunge and Walleye fishery. A boat launch operated by the Minneapolis Park and Recreation Board is located on the northeast corner of the lake, with a limited amount of street parking nearby. From 2013 and still in place as of this report (early spring 2015), city-imposed inspections for aquatic invasive species include evening / overnight ramp closures. Additionally, there is a fishing pier and ample shore fishing opportunities as the lake is encircled by bike and pedestrian paths. Motor use is restricted to electric-only; other motors may remain attached but must be propped up. A population assessment was conducted during the summer of 2014 to determine the species composition and abundance of game fish in the lake.
2014's gill net catch of 1.9 Walleye per gill net was below average for this type of lake. Few large Walleyes were sampled, but the average size was good (16.6 inches and 1.68 pounds). Sixty-three percent of the sampled fish exceeded 15 inches in length. Walleye growth was average when compared to similar lakes; fish reached 13.8 inches by age 3 and 18.5 inches by age 5.
The catch of 5.7 Northern Pike per gill net is above average. Additionally, Northern Pike displayed a good size structure, with an average length and weight of 23.2 inches and 3.06 pounds. Eighty percent of the measured fish were longer than 21 inches, and 12% were longer than 28 inches. Ages 1-7 were sampled, and the fish are growing at a fast rate for this Lake Class.
Black Crappie abundance remains low, at 2.4 fish/ gill net in the 2014 survey. The fish averaged 7.0 inches and 0.17 pounds. Ten percent of the sample was longer than 8 inches and the largest fish measured 8.8 inches.
At 41.6 fish per trap net, Bluegill relative abundance was above median levels for this type of lake. Sampled Bluegill averaged 5.9 inches and only 3 percent of the catch exceeded 7.0 inches. The population is dominated by small individuals where fish reached an average length of 6.2 inches by age 5.
In 2014, 1.1 Yellow Perch per gill net were caught, which is low for this Lake Class. None of the sampled fish exceeded 8 inches, and the average size was 6.2 inches and 0.10 pounds.
Other fish sampled during this survey included Hybrid Sunfish, Pumpkinseed, Green Sunfish, Bowfin and Common Carp.
- 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.