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Biology, population structure, and estimated forage requirements of lake trout in Lake Michigan

Author: Gary W Eck; LaRue Wells
Publisher: Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, 1983.
Series: Technical papers of the U.S. Fish and Wildlife Service, 111.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
Data collected during successive years (1971-79) of sampling lake trout in Lake Michigan were used to develop statistics on lake trout growth, maturity, and mortality, and to quantify seasonal lake trout food and food availability. These statistics were then compiled with data of lake trout year-class strengths and age-specific food conversion efficiencies to compute production and forage fish comsumption by lake  Read more...
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Additional Physical Format: Online version:
Eck, Gary W.
Biology, population structure, and estimated forage requirements of lake trout in Lake Michigan.
Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, 1983
(OCoLC)897545981
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Gary W Eck; LaRue Wells
OCLC Number: 9762189
Description: 18 pages : illustrations ; 26 cm.
Series Title: Technical papers of the U.S. Fish and Wildlife Service, 111.
Other Titles: Technical Report Archive & Image Library (TRAIL)
Responsibility: by Gary W. Eck, LaRue Wells.

Abstract:

Data collected during successive years (1971-79) of sampling lake trout in Lake Michigan were used to develop statistics on lake trout growth, maturity, and mortality, and to quantify seasonal lake trout food and food availability. These statistics were then compiled with data of lake trout year-class strengths and age-specific food conversion efficiencies to compute production and forage fish comsumption by lake trout in Lake Michigan during the 1979 growing season. Lake trout consumed an estimated 3,037 t of forage fish, to which alewives contributed about 71%, rainbow smelt 18%, and slimy sculpins 11%. Seasonal changes in bathymetric distributions of lake trout with respect to those forage fish of a suitable size for prey were major determinants of the size and species compositions of fish in the seasonal diet of lake trout.

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