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Population biology of lake trout (Salvelinus namaycush) of Lake Superior before 1950

Journal of the Fisheries Research Board of Canada

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Abstract

Scale samples collected in 1948 were used to estimate the instantaneous total mortality rate (0.70) and growth for lake trout (Salvelinus namaycush) in Lake Superior before the population had been significantly reduced by the sea lamprey (Petromyzon marinus). Indirect evidence indicates that the instantaneous natural mortality rate was probably 0.10-0.25. The Ricker model was used to calculate yield per recruitment, which varied with natural mortality and growth. Natural mortality was more critical than growth; yield per recruitment increased 183.3% with a 60% decrease in instantaneous natural mortality (from 0.25 to 0.10). For the prelamprey lake trout population the yield per recruitment was about 12-34 lb; the recruitment of about 3.6-10.1 million lake trout of age 1.5 resulted in an annual commercial production of 4 million lb.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Population biology of lake trout (Salvelinus namaycush) of Lake Superior before 1950
Series title:
Journal of the Fisheries Research Board of Canada
Volume
28
Issue:
1
Year Published:
1971
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 65-71
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
65
Last page:
71
Number of Pages:
6