Ann Lake is a shallow lake prone to summerkill and winterkill events. The last partial summerkill occurred in 2004. The gamefish community has since rebounded and should provide good fishing opportunities in absence of another die off.
Alternate year fry stockings have been used to restore and maintain a walleye population. Stockings have provided excellent, but short-term fishing opportunities in previous years. Survey results indicated that walleye fry stocking success was good in 2009. Gillnet catches averaged 15.0 fish/net. The majority of sampled fish were from this single stocked year class. These young fish should reach a harvestable size in 2012. Average length at time of the survey was 11.5 inches. Largemouth bass numbers have increased substantially in recent years. Average size of sampled fish was small, but this young population will provide quality angling opportunities in the near future. Mean length of sampled fish was 11.4 inches. The largest bass measured was 14.1 inches in length. A record-high black crappie catch rate was recorded in 2010. Mean length of sampled fish was 8.0 inches. Six percent of sampled fish exceeded 12.0 inches in length. Bluegill numbers have also increased. Trapnet catches averaged 4.4 fish/net, which is a record-high catch rate for Ann Lake. Mean length was 5.6 inches. Growth is rapid. Age-2 fish averaged 5.7 inches at time of capture. A re-introductory stocking of yellow perch was completed in 2007 following their absence from the fishery during the previous two surveys. Gillnet catches averaging 34.7 fish/net in 2010 indicates a successful re-introductory stocking and reproducing population. Mean length of sampled fish was 7.7 inches. The largest perch capture measured 11.7 inches in length. Northern pike numbers are low following a record high catch in 2005. Average size is small. White suckers and young carp are extremely abundant.