Koronis Lake

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What kind of fish can you catch in Koronis Lake?

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What aquatic invasive species are found in Koronis Lake?

A fish population assessment of Lake Koronis was conducted in late July of 2003. Koronis is a large, deep, and productive lake located primarily in Stearns County. Koronis is a popular fishery for walleye, northern pike, smallmouth bass, and bluegill. Koronis receives moderate recreational use during the summer months. The lake is highly developed with homes and cabins. In addition, the city of Paynesville is within two miles of the lake. Nutrient runoff enters Koronis from agricultural, city storm sewer, and lake residential sources. There are five public access sites on Koronis. Aquatic vegetation densities are variable yearly in the lake. Hardstem bulrush stands are limited within the lake. There are three large islands located on Koronis. Shoalwater substrates are varied with boulder, rubble, gravel, sand, and silt. Water clarity was moderate to low during the 2003 population assessment (secchi=5.2 feet). Water levels were normal during the spring and early summer, but low by fall due to drought conditions in 2003. The largest inlet is the North Fork of the Crow River, which enters Koronis along the east shore and outlets near the southeast corner. Black crappie numbers were low in 2003 (0.5 fish/trapnet) and near the low end of the normal range for similar lakes. The Koronis black crappie historical average catch rate is 0.7 fish/trapnet. The 2003 black crappie average size was small (0.16 pounds and 5.9 inches) from trapnets. The Koronis black crappie historical average length is 8.5 inches. Black crappie growth rates were within or above the normal ranges for ages 1-4 compared to area lakes. The 2002 black crappie year class comprised 86% of the 2003 total black crappie catch in Koronis. Bluegill numbers were low to moderate in 2003 (12.1 fish/trapnet) and within the normal range for similar lakes. The Koronis bluegill historical average catch rate is 8.5 fish/trapnet. The 2003 bluegill average size was small (0.04 lbs. and 3.7 inches) from trapnets. The Koronis bluegill historical average length is 4.9 inches from trapnets. Northern pike numbers were moderate to high in 2003 (5.6 fish/gillnet) and within the normal range for similar lakes. The Koronis northern pike historical average catch rate is 2.2 fish/gillnet. The 2003 northern pike average size was moderate (3.7 lbs. and 24.9 inches) from gillnets. The Koronis northern pike historical average length is 23.5 inches from gillnets. Northern pike growth rates in Koronis were generally above the normal ranges compared to area lakes. The 2001 Northern pike year class comprised 51% of the 2003 total northern pike assessment catch in Koronis. The largest northern pike captured was 36.5 inches in the 2003 assessment. Smallmouth bass numbers were moderate in 2003 (1.0 fish/gillnet), but above the normal range for similar lakes. The smallmouth bass historical average catch rate is 0.6 fish/gillnet from Koronis. The 2003 smallmouth bass average size was moderate (1.3 lbs. and 11.3 inches) from gillnets. The smallmouth bass historical average length is 12.7 inches from gillnets. The 2002 smallmouth bass year class comprised 36% of the total 2003 smallmouth bass summer assessment catch in Koronis. Smallmouth bass growth rates in Koronis were generally above the normal ranges compared to similar area lakes. The largest smallmouth bass captured in the 2003 summer assessment was 20.0 inches. Largemouth bass numbers were low in the Koronis 2003 spring electrofishing survey (15.3 fish/hour). The Spicer area historical average largemouth bass catch rate is 46.1 fish/hour from spring electrofishing. Previous spring electrofishing largemouth bass catch rates for Koronis were moderate in 1990 (36.7 fish/hour, 9.2 inches average size) and 1991 (26.4 fish/hour, 10.0 inches average size). The 2003 largemouth bass average size was moderate (1.21 pounds and 12.2 inches) from spring electrofishing. The 2000 year class comprised 43% of the Koronis 2003 total spring electrofishing largemouth bass catch. Koronis largemouth bass growth rates were generally above the normal ranges compared to area lakes. The largest largemouth bass captured during the Koronis 2003 spring electrofishing survey was 16.1 inches. Tullibee "cisco" numbers were low in 2003 (0.9 fish/gillnet) and near the low end of the normal range for similar lakes. The tullibee historical average catch rate is 1.2 fish/gillnet for Koronis. The 2003 tullibee average size was large (1.57 lbs. and 13.9 inches) from gillnets. The tullibee historical average length is 12.6 inches from gillnets. Tullibee are an important forage species for both large northern pike and large walleye. Yellow perch numbers were high in 2003 (68.8 fish/gillnet) compared to the normal range for similar lakes. The yellow perch historical average catch rate is 65.3 fish/gillnet for Koronis. The 2003 yellow perch average size was small (0.11 lbs. and 6.2 inches) from gillnets. The yellow perch historical average length is 6.9 inches from gillnets. Walleye abundance in 2003 (7.3 fish/gillnet) was within the normal range for similar lakes, but slightly below the Koronis historical average catch rate (8.9 fish/gillnet). The 2003 walleye average weight and length were 1.44 lbs. and 14.9 inches respectively from gillnets. The walleye historical average length is 13.7 inches from gillnets. The catch rate of quality size (15.0 inches) and larger walleye in 2003 (1.5 fish/gillnet) was lower than the historical average (2.7 fish/gillnet) for Koronis. The 2001 year class (stocked and natural reproduction) comprised 34% of the Koronis total 2003 walleye assessment catch. Walleye growth rates calculated from the 2003 Koronis assessment were generally below the normal ranges for ages 1-8 compared to area lakes, but slightly above average compared to historical growth rates for Koronis. Walleye natural reproduction in Koronis was generally both frequent and adequate to sustain walleye numbers based on previous fall and summer surveys from 1993-2003. Walleye fingerlings (2,830 fish, 215 pounds) were last stoc

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