Lake Superior is home to some of the largest freshwater fish found in the Great Lakes. Its enormous size, cold, deep waters, and extensive bays and tributaries provide habitat for both native species and introduced fish that can grow to impressive proportions.
Among the large fish found in Lake Superior, lake sturgeon, lake trout, muskellunge, Chinook salmon, and northern pike stand out for their size. However, the maximum size of these species varies considerably, and species-wide records do not necessarily come from Lake Superior. This list therefore focuses on documented size and known size potential in the lake rather than using records from other waters.
This guide covers the 5 biggest fish in Lake Superior, with a focus on size, habitat, and feeding behavior.
Table of Contents
Quick Comparison Table: 5 Biggest Fish in Lake Superior
| Rank | Fish | Maximum / Documented Size | Typical Size | Habitat in Lake Superior |
|---|---|---|---|---|
| 1. | Lake Sturgeon | 310 lb; nearly 8 ft | 4–6 ft; 30–80 lb | Bays, river mouths, tributaries, lake bottom |
| 2. | Lake Trout | 61.5 lb; 49 in | Much smaller; commonly under 20 lb | Cold, deep offshore waters |
| 3. | Muskellunge | 5+ ft; 70+ lb species potential | Usually much smaller | Bays, nearshore waters, connected rivers |
| 4. | Chinook Salmon | 30+ lb documented in Lake Superior | About 3–8 lb | Open lake; tributaries during spawning |
| 5. | Northern Pike | Around 40 in | Usually smaller | Shallow bays, wetlands, nearshore waters |
Lake Sturgeon
The lake sturgeon (Acipenser fulvescens) is the biggest fish in Lake Superior and the largest species featured in this ranking. This ancient freshwater fish can grow to extraordinary proportions, with large individuals reaching several feet in length and weighing well over 100 pounds.
Lake Superior produced an exceptionally large specimen in 1922. A 310-pound lake sturgeon was caught in Batchawana Bay on the Ontario side of Lake Superior. The fish measured nearly 8 feet long and remains the largest fish documented from the lake.
Most lake sturgeon are nowhere near that size. Adults commonly reach about 4 to 6 feet in length, while the largest individuals can become much heavier after decades of slow growth. Their exceptionally long lifespan allows some fish to continue growing for many years.
Lake sturgeon are bottom-dwelling fish that use four sensitive barbels beneath their snout to locate food along the lakebed. Their diet includes insect larvae, crayfish, small crustaceans, and other bottom-dwelling organisms. In Lake Superior, they are associated with the lake as well as bays, river mouths, and tributaries used for spawning.
Lake Trout
The lake trout (Salvelinus namaycush) is one of the largest native fish in Lake Superior and the second-largest fish in this ranking based on documented Lake Superior size. Exceptional individuals can grow to more than 4 feet long and weigh over 60 pounds. Michigan’s documented Lake Superior record is 61.5 pounds and 49 inches, caught in 1997.
Lake trout are especially well adapted to Lake Superior’s cold, deep waters. They commonly occupy cold, well-oxygenated areas and can move into deeper water as conditions change. Their ability to tolerate temperatures that are unsuitable for many other fish allows them to thrive throughout much of the lake.
As lake trout grow, their diet becomes increasingly focused on fish. Larger individuals prey on species such as ciscoes and rainbow smelt, while other forms of lake trout, including deepwater siscowet, may rely more heavily on invertebrates. Access to abundant forage helps the largest individuals build substantial body mass.
Lake trout are also exceptionally long-lived. In 2025, Michigan Department of Natural Resources researchers documented a 62-year-old lake trout from Lake Superior, illustrating how many decades these fish can spend growing in the lake’s cold waters.
Muskellunge
The muskellunge (Esox masquinongy), commonly called the musky, is one of the largest predatory fish found in the Lake Superior basin. It has a long, powerful body, a broad head, and a large mouth lined with sharp teeth. In Lake Superior, muskellunge are relatively localized and are mainly associated with bays, nearshore waters, and connected rivers rather than the deepest parts of the lake.
Muskellunge can exceed 5 feet in length and reach very high weights elsewhere in their range. However, the largest muskellunge records from other Wisconsin waters should not be presented as Lake Superior records. The famous 69-pound 11-ounce Wisconsin record, for example, came from Chippewa Flowage rather than Lake Superior.
In Lake Superior, muskellunge are ambush predators that use vegetation, submerged logs, rocky areas, and other cover to conceal themselves before striking prey. Their diet consists primarily of fish, including suckers and other available forage species.
Wisconsin’s Lake Superior fisheries plan identifies muskellunge populations in the lake and connected waters, including the St. Louis River system. The species is managed as a sport fish in Wisconsin’s Lake Superior waters, where the minimum length limit is 40 inches.
Chinook Salmon
The Chinook salmon (Oncorhynchus tshawytscha), also known as the king salmon, is the largest of the introduced Pacific salmon found in Lake Superior. Although native to the Pacific Ocean basin, Chinook salmon were introduced into the Great Lakes and now reproduce naturally in parts of Lake Superior.
Chinook salmon can reach impressive sizes in Lake Superior. Historical fisheries research has documented fish weighing more than 30 pounds, although individuals of this size are exceptional. The same research found that average Chinook size in Lake Superior was historically around 7 to 12 pounds, while mature fish in more recent years have commonly been much smaller, often around 4 to 8 pounds.
Their growth is closely tied to the availability of forage fish. Young Chinook initially feed on insects, aquatic invertebrates, and small fish, but adults become primarily fish-eaters. In Lake Superior, important prey includes rainbow smelt and ciscoes.
Adult Chinook spend most of their lives feeding in Lake Superior before migrating into tributary rivers and streams in the fall to spawn. They normally mature between about three and five years of age, after which they die following reproduction.
Northern Pike
The northern pike (Esox lucius) rounds out the five biggest fish in Lake Superior. Unlike lake trout, which are adapted to the lake’s cold, deep offshore waters, northern pike are primarily associated with shallow bays, wetlands, river mouths, and nearshore areas where vegetation and other cover provide suitable habitat.
Northern pike can reach impressive lengths in the Lake Superior region, with trophy fish reaching around 40 inches. However, a 30- to 40-pound maximum should not be presented as a typical or Lake Superior-specific size because stronger documentation for the lake is based on length rather than such extreme weights.
Northern pike are aggressive ambush predators. They use vegetation, submerged structures, and other shallow-water cover to conceal themselves before making rapid attacks on smaller fish. Their elongated bodies and powerful acceleration make them particularly effective predators in protected bays and nearshore habitats.
In Lake Superior, northern pike are concentrated more heavily in suitable shallow waters and connected systems than in the deep open lake. Wisconsin’s Lake Superior fisheries plan documents pike populations in areas including the St. Louis River Estuary and Chequamegon Bay, with lower-density populations along parts of the southern shore.