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Ups and Downs of Burbot and their predator Lake Trout in Lake Superior, 1953-2011

Transactions of the American Fisheries Society

By:
and
DOI: 10.1080/00028487.2013.824918

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Abstract

The fish community of Lake Superior has undergone a spectacular cycle of decline and recovery over the past 60 years. A combination of Sea Lamprey Petromyzon marinus depredation and commercial overfishing resulted in severe declines in Lake Trout Salvelinus namaycush, which served as the primary top predator of the community. Burbot Lota lota populations also declined as a result of Sea Lamprey depredation, largely owing to the loss of adult fish. After Sea Lamprey control measures were instituted in the early 1960s, Burbot populations rebounded rapidly but Lake Trout populations recovered more slowly and recovery was not fully evident until the mid-1980s. As Lake Trout populations recovered, Burbot populations began to decline, and predation on small Burbot was identified as the most likely cause. By 2000, Burbot densities had dropped below their nadir in the early 1960s and have continued to decline, with the densities of juveniles and small adults falling below that of large adults. Although Burbot populations are at record lows in Lake Superior, the density of large reproductive adults remains stable and a large reserve of adult Burbot is present in deep offshore waters. The combination of the Burbot's early maturation, long life span, and high fecundity provides the species with the resiliency to remain a viable member of the Lake Superior fish community into the foreseeable future.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Ups and Downs of Burbot and their predator Lake Trout in Lake Superior, 1953-2011
Series title:
Transactions of the American Fisheries Society
DOI:
10.1080/00028487.2013.824918
Volume
142
Issue:
6
Year Published:
2013
Language:
English
Publisher:
American Fisheries Society
Contributing office(s):
Great Lakes Science Center
Description:
16 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Transactions of the American Fisheries Society
First page:
1757
Last page:
1772
Country:
United States
Other Geospatial:
Lake Superior