Recovery and decline of lake whitefish in U.S. waters of eastern Lake Ontario, 1980-2001
Technical Report
66
Out-of-print
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Abstract
The lake whitefish (Coregonus clupeaformis) was an important member of the native fish community and a valued commercial species in Lake Ontario. Lake whitefish were common in U.S. waters of the lake until 1965 and very abundant in Canadian waters through the early 1970s, although their numbers declined shortly thereafter. During 1975-1985, lake whitefish stocks remained depressed throughout the lake as a result of the combined effects of degraded water quality, overfishing, and predation. Rainbow smelt (Osmerus mordax) probably preyed on whitefish fry, and sea lamprey (Petromyzon marinus) preyed on adults. During 1985-1987, lake whitefish stocks began to recover in eastern Lake Ontario, and their buildup continued into the mid-1990s. Reasons for the recovery likely included control of the sea lamprey population and a reduction in the number of piscivorous rainbow smelt. By 1997, lake whitefish abundance had declined severely again; some fish appeared to have dispersed from the northeastern to the southeastern regions of the lake, and the depth of capture increased. We believe that the collapse of Diporeia spp. populations during 1992-1999 was responsible for the decline in the lake whitefish populations and the shifts in geographic and bathymetric distribution because lake whitefish fed primarily on Diporeia spp. After the collapse of Diporeia spp. populations, lake whitefish in southeastern Lake Ontario fed on Mysis relicta and quagga mussels (Dreissena bugensis). Changing from a diet of high-lipid Diporeia spp to low-lipid dreissenids and foraging on Mysis relicta at lower temperatures are apparently hampering the rebuilding of lake whitefish stocks.
Suggested Citation
Owens, R.W., O’Gorman, R., Eckert, T.H., Lantry, B.F., Dittman, D.E., 2005, Recovery and decline of lake whitefish in U.S. waters of eastern Lake Ontario, 1980-2001: Technical Report 66, p. 141-155.
| Publication type | Report |
|---|---|
| Publication Subtype | Other Report |
| Title | Recovery and decline of lake whitefish in U.S. waters of eastern Lake Ontario, 1980-2001 |
| Series title | Technical Report |
| Series number | 66 |
| Year Published | 2005 |
| Language | English |
| Publisher | Great Lakes Fishery Commission |
| Publisher location | Ann Arbor, MI |
| Contributing office(s) | Great Lakes Science Center |
| Description | p. 141-155 |
| Larger Work Type | Report |
| Larger Work Subtype | Other Report |
| Larger Work Title | Proceedings of a workshop on the dynamics of lake whitefish (Coregonus clupeaformis) and the amphipod Diporeia spp. in the Great Lakes |
| First page | 141 |
| Last page | 155 |