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The threespine stickleback (Gasterosteus aculeatus) was not known to occur in the Great Lakes above Niagara Falls until 1980, when it was collected in South Bay, Manitoulin Island, in the Lake Huron basin. By 1984 this species had been found in tributaries of Lakes Huron and Michigan, and in the open waters of both lakes. All specimens identified were the completely plated morph that is most prevalent in fresh water along the east coast of North America. The status of this species in Lakes Huron and Michigan appears to be 'Possibly Established.' If threespine stickleback increase in abundance they may eventually provide additional forage for large salmonids.
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Introduction and spread of the threespine stickleback (Gasterosteus aculeatus) in Lakes Huron and Michigan