Shortnose cisco (Coregonus reighardi) COSEWIC assessment and status report: chapter 8
Limiting Factors and Threats
The declines of shortnose cisco in lakes Huron, Michigan and Ontario were the result of commercial overfishing (Moffett 1957, Smith 1964, Berst and Spangler 1973, Christie 1973). Commercial fishing of deepwater ciscoes, including shortnose cisco, no longer occurs in the American waters of the Great Lakes, except for a small portion of northwestern Lake Huron, but still takes place, to a limited degree, in the Canadian waters of lakes Huron and Superior.
Shortnose cisco was likely preyed upon by native lake trout and burbot. Although it has been suggested that remnant shortnose cisco populations may have competed with, or have been preyed upon by, introduced fish species in lakes Huron, Michigan and Ontario, evidence from Lake Superior for other deepwater cisco species suggests that these species were probably not a major threat to larger species of deepwater ciscoes.
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