Distribution
The distribution of the Deepwater Sculpin is almost entirely limited to Canada with the exception of the American Great Lakes and a few inland lakes in Michigan, Minnesota and Montana. A September 2007 study by the Waterton Lakes National Park and the University of Lethbridge found that the Deepwater Sculpin is the third most common fish in Upper Waterton Lake in extreme northwestern Montana and Canada.
"In Canada, its distribution is patchy and limited to cold, deep lakes in areas that were formerly glaciated or with proglacial lake connections. This includes the Gatineau region through the Laurentian Great Lakes, Manitoba and Saskatchewan and northward to Great Bear and Great Slave lakes in the Northwest Territories. An isolated population also exists in Waterton Lake, Alberta. Designated at risk (Special Concern) are the Great Lakes-Western St. Lawrence populations, which are found in only 10 lakes in eastern Canada. In Ontario, this fish occurs in lakes Nipigon, Ontario, Superior, Fairbank, Huron and Erie. In Lake Erie, only larvae (young-of-the-year) have been observed. In Quebec, it occurs in Lac des Îles and in Roddick, Thirty-one-Mile and Heney lakes. Populations in Heney Lake and Lac des Îles are in decline or may even no longer exist."
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