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Alewife ⚠ Invasive

πŸ”¬ Alosa pseudoharengus

A small, silvery herring that entered the Great Lakes through the Welland Canal. By the 1960s, alewives had exploded to comprise over 90% of the fish biomass in Lake Michigan and were washing up on beaches in massive die-offs measured in tens of thousands of tons. The ecological crisis prompted MDNR to introduce Pacific salmon in 1966 specifically to eat them. Salmon planting worked -- and created the Great Lakes sport fishery Michigan now enjoys.

2-6 inches
Typical size
8
Listed lakes

πŸ›‘ Conservation Status

⚠ Invasive Invaded the Great Lakes through the Welland Canal -- present in all Great Lakes by the 1940s-50s. Massive die-offs in the 1960s created public health crises on Michigan beaches. The MDNR's decision to introduce coho salmon in 1966 to control alewife populations created the modern Great Lakes sport fishery. Alewife populations are now much reduced but remain an important forage species for salmon and lake trout. Their decline has ironically contributed to nutrient changes in the Great Lakes.

🌿 Habitat & Behavior

Open Great Lakes water. Schools in massive aggregations. Rarely enters inland waters except through river connections.

🌊 Where to Catch in Michigan

Lake County Population Notes
Charlevoix Lake
17,260 acres
Charlevoix Good Invasive forage base for salmon and lake trout
Indian Lake
8,689 acres
Schoolcraft Good Invasive forage base for salmon and lake trout
Lake Gogebic
13,380 acres
Gogebic Good Invasive forage base for salmon and lake trout
Lake Michigamme
4,149 acres
Marquette Good Invasive forage base for salmon and lake trout
Lake St. Clair
260,000 acres
Macomb Good Invasive forage base for salmon and lake trout
Mullett Lake
16,630 acres
Cheboygan Good Invasive forage base for salmon and lake trout
Muskegon Lake
4,150 acres
Muskegon Good Invasive forage base for salmon and lake trout
Muskegon Lake
4,150 acres
Muskegon Good Invasive forage base for salmon and lake trout

πŸ“¦ DNR Stocking History

No stocking records are on file for Alewife.

This is common for several reasons: this species may reproduce naturally and not require stocking (e.g. Largemouth Bass, Northern Pike), it may be managed under a different program not tracked here, or records may predate our database. For the most current data, check the Michigan DNR Stocking Database directly.

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