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Lake Michigan's capacity to support lake trout (Salvelinus namaycush) and other salmonines: an estimate based on the status of prey populations in the 1970s

Canadian Journal of Fisheries and Aquatic Sciences

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Abstract

We used a mass balance equation relating total mortality of age II and older alewives (Alosa pseudoharengus) to their removals by predatory fish and other sources of mortality as the basis for estimating that the forage base in Lake Michigan could support an additional 13,000 to 21,000 t of lake trout (Salvelinus namaycush) or a total lake trout biomass between 15,000 and 23,000 t. This biomass estimate is projected with biomasses of other trout and salmon held at 1979 levels. Major premises of this approach are that (1) the sustained availability of age II and older alewives to salmonines will ultimately limit the expansion of salmonine stocks, (2) the alewife population was oscillating without trend during 197380, and (3) additional limited predation on alewives would be compensated by a reduction in natural mortality caused by physiological stress and disease.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lake Michigan's capacity to support lake trout (Salvelinus namaycush) and other salmonines: an estimate based on the status of prey populations in the 1970s
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
Volume
42
Issue:
3
Year Published:
1985
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 449-454
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Fisheries and Aquatic Sciences
First page:
449
Last page:
454
Number of Pages:
5