Winnibigoshish Lake Fishing guide

Major changes have been occurring within the system over the past 15 years. These changes began around the time of the discovery of invasive Faucet Snails in 2007, followed by the detection of larval Zebra Mussels in 2012, and adult Zebra Mussels in 2016. These invasives are filter feeders that can dramatically increase water clarity and reduce the abundance of plankton available to fish. Prior to the introduction of these invasives, water clarity (measured with a Secchi disc) averaged 6 to 7 feet and the highest ever recorded was 10 feet. There has been a post-invasion trend of increasing water clarity in Winnibigoshish. Secchi disc readings in 2025 were not as high as the previous two years, but still well above average with a range of 7 to 22 feet. Increasing water clarity tends to improve habitat for Bass, Sunfish, and Northern Pike while decreasing habitat suitability for Walleye.

Walleye is the primary management species in Winnie, and a large proportion of the field work completed is dedicated toward tracking the status of this species. The most important tool to assess the Walleye population is a gill net survey that is completed annually in September. The Walleye catch rate in the gill net survey was up from the 2024 survey year but still less than the historic average. Walleye recruitment (survival to the fishery) is naturally variable in any lake, and Winnie is no exception. Two year classes make up the majority of the Walleye in the lake. The 2023 year class averaged 14 inches in the fall of 2025 and are currently providing the majority of the harvest opportunities for anglers. The other most commonly caught age group is the 2019 year class. These have now mostly grown into the protected slot, with males averaging 18 inches and females averaging 20 inches. These two year classes are the most prolific in the lake currently but there were a total of 12 year classes sampled during the 2025 fall gill net survey, with the oldest being a 17 year old male.

There is a history of high angling pressure on Yellow Perch in Winnibigoshish. Perch are also a valuable prey item for predators such as Walleye and Northern Pike. Perch catch rates in gill net surveys have been declining for about two decades. It is thought that the decline in Perch abundance is closely related to the decline in Tullibee, which are an important prey fish for Walleye and Northern Pike in Winnie. In more recent history, there were several years of poor Perch recruitment leading up to a record low gill net catch rate in 2022. However, in the past three years there has been good recruitment of young fish and catches have increased since then. Growth has been increasing the past several years and has now reached the point where some are reaching harvestable size two years earlier than average.

Northern Pike is another popular species amongst Winnibigoshish anglers and spearers. Tributary inlet areas and connected waters provide a great deal of spawning habitat, which results in consistent recruitment of Northern Pike to the fishery. The population is generally characterized as having high abundance and relatively poor to moderate size structure when compared to other large lakes. In 2025 the fall gill net catch rate was low compared to historical catches for Winnibigoshish, but still within the expected range for similar lakes. The population peaked in abundance in 2017 and has stabilized at a lower level the past few years, which is likely one of the biggest factors in the recovery of the Perch population. Pike averaged 22 to 23 inches and ranged from about 16 to 33 inches during the fall gill net survey. An additional targeted survey was completed shortly after ice-out in 2025. Sizes caught during that survey ranged from 8 to 37 inches. Winnibigoshish is part of the north-central zone for Northern Pike regulations that includes a protected slot of 22 to 26 inches. Release of Northern Pike over 26 inches is encouraged to help improve the overall size structure of the population.

Tullibee, otherwise known as Cisco, are an important prey fish in lakes where they occur, and at times can be a popular species for anglers to target. The population in Winnibigoshish has fluctuated over time, but has generally been trending down since annual surveys began in 1983. Over the past 15 years there has been a sharp decline in abundance. The gill net catch rate in 2025 was well below average for Winnie. The decline in the population is attributed to several factors. Tullibee feed primarily on zooplankton, which has decreased due to the presence of Zebra Mussels. Tullibee also require cold water and in some years the water temperatures in Winnibigoshish can surpass stressful or even lethal thresholds. The decline in Tullibee has changed the diet of predators such as Walleye and Northern Pike, which now primarily feed on Yellow Perch instead of Tullibees.

Other species that may be of interest to anglers include Bluegill, Black Crappie, Burbot, Largemouth Bass, Rock Bass, and Muskellunge. Panfish and Bass in Winnie are typically low in abundance, with most of the population concentrated in certain areas of the lake where vegetation is abundant. Sunfish species are more commonly targeted in the Cut Foot Sioux chain. The popularity of that fishery and the high-quality size structure of the population led to the addition of a 5 fish bag limit for Sunfish throughout the entire Winnie reservoir. Muskellunge are difficult to sample in Winnie with traditional survey gear, making relatively accurate population estimates nearly impossible. It is generally accepted that this is a low-density population, and it is completely sustained by natural reproduction. Burbot are also difficult to assess with traditional open-water survey nets but appear to be popular with some anglers during the ice fishing season.

Invasive species cause economic or environmental harm, or harm to human health. They are illegal to introduce into or move between state waters and can impact energy flow, food chains, and fish species assemblages. Current known invasive species in Winnibigoshish include Zebra Mussels, Faucet and Mystery Snails, and Starry Stonewort. Rusty Crayfish are found in Cass Lake upstream of Winnie, and one was found in a net immediately upstream of the lake in the Mississippi River in 2025. Crayfish are incidentally caught in gill nets and over the past three years over 1400 have been inspected to search for evidence of the presence of Rusty Crayfish. No Rusty Crayfish have been found in the lake as of 2025, but it is likely that this invasive will be found in Winnie in the near future.

Changes in environmental conditions affect fish habitat and behavior, which likely affect fish sampling and angling success. Movement of any type of equipment that can trap or hold contaminated water, plant fragments or aquatic organisms can be a potential vector of spread if precautions are not taken. To avoid the spread of these unwanted species, ensure that all equipment is thoroughly cleaned and dried before moving to a new body of water. More information is available at https://www.dnr.state.mn.us/invasives/ais/index.html