Gunn Lake is a 342-acre lake in Itasca County within the Big Fork River watershed. Gunn Lake is approximately 8 miles east of Marcell, MN. The lake has a maximum depth of 39 ft and 142 littoral acres. A public access is located on the west shore. Water clarity was moderate with a Secchi disk reading of 9.0 ft. Northern pike gill-net catch was 5.0/net, which was within the expected range for similar lakes. Northern pike gill-net catch has varied from 2.3 to 7.0/net in previous assessments. Size structure was moderate with a few fish greater than 28 inches. Growth was similar to the statewide average with fish reaching preferred length of 28 inches in 6 years.Bluegill trap-net catch was 13.6/net, which was within the expected range for similar lakes. Abundance in past assessments has varied from 13.5 to 128.0/trap net. Size structure was poor with few fish greater than 8 inches. Black crappie gill-net catch was 0.4/net, which was lower than the expected range. Gill-net catch rates in past assessments varied from 0.9 to 2.3/net. The trap-net catch rate was 1.8/net, which was within the expected range for similar lakes. Trap-net catch rates in past assessments varied from 1.3 to 4.3/net. Although abundance was low, size structure was good with a few fish greater than 9 inches. Growth was similar to the statewide average with fish reaching 9 inches in 5 years. Largemouth bass trap-net catch was 1.0/net, which was within the expected range. Catch rates in past assessments have varied from 0.8 to 3.8/net. Electrofishing was used to sample largemouth bass this spring for the first time on Gunn Lake. The catch rate was 27.3/h, which was slightly higher than the average catch rate of 25.8/h for area class 31 lakes. Size structure was moderate with a few fish exceeding 15 inches. Largemouth bass grew similar to the statewide average with fish reaching preferred length of 15 inches in 7 years. Yellow perch were sampled in low abundance with a gill-net catch of 0.1/net. Abundance in past assessments has varied from 0.4 to 7.0/net. Other species sampled include pumpkinseed sunfish, rock bass, white sucker, common shiner, golden shiner, and brown bullhead.In order to maintain or improve fish and wildlife populations water quality and habitat must be protected. People often associate water quality problems with large-scale agricultural, forestry, urban development or industrial practices in the watershed. In reality, the impact of land use decisions on one lake lot may be relatively small, yet, the cumulative impact of those decisions on many lake lots can result in a significant decline in water quality and habitat. For example, removing shoreline and aquatic vegetation, fertilizing lawns, mowing to the waters edge, installing beach sand blankets, failing septic systems and uncontrolled run-off, all contribute excess nutrients and sediment which degrade water quality and habitat. Understanding these cumulative impacts and taking steps to avoid or minimize them will help to insure our quality fisheries can be enjoyed by future generations.