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Declining survival of lake trout stocked during 1963-1986 in U.S. waters of Lake Superior

North American Journal of Fisheries Management

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Abstract

The average catch per effort (CPE) values for the 1963-1982 year-classes of stocked lake trout Salvelinus namaycush caught at age 7 in gill nets and for the 1976-1986 year-classes caught at ages 2-4 in trawls declined significantly in U.S. waters of Lake Superior. The declines in CPE were not explained by reduced stocking, but rather by significant declines in survival indices of the year-classes of stocked lake trout. Increases in mortality occurred in year-classes before the fish reached ages 2-4, before they were recruited into the sport and commercial fisheries, and before they reached sizes vulnerable to sea lamprey predation. We conclude that declining abundance of stocked lake trout resulted from increased mortality, which may have been caused by competition, predation, or by a combination of these and other factors. Restoration of lake trout in Lake Superior may now depend on prudent management of naturally reproducing stocks rather than on stocking of hatchery-reared fish.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Declining survival of lake trout stocked during 1963-1986 in U.S. waters of Lake Superior
Series title:
North American Journal of Fisheries Management
Volume
14
Issue:
2
Year Published:
1994
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 395-402
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
North American Journal of Fisheries Management
First page:
395
Last page:
402