| Abstract: | Data collected during successive years (1971-79) of sampling lake trout (Salvelinus namaycush) 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 combined with data on lake trout year-class strengths and age-specific food conversion efficiencies to compute production and forage fish consumption by lake trout in Lake Michigan during the 1979 growing season (i.e., 15 May-1 December). An estimated standing stock of 1,486 metric tons (t) at the beginning of the growing season produced an estimated 1,129 t of fish flesh during the period. The lake trout consumed an estimated 3,037 t of forage fish, to which alewives (Alosa pseudoharengus) contributed about 71%, rainbow smelt (Osmerus mordax) 18%, and slimy sculpins (Cottus cognatus) 11%. Seasonal changes in bathymetric distributions of lake trout with respect to those of 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. |
| Genre: | Federal Government Series |
| ProdID: | 37575 |
| Citation Author: | Eck, Gary W.; Wells, LaRue |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation End Page: | 18 |
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| Citation Language: | English |
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| Citation Number Of Pages: | 18 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | 18 p. |
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| Citation Public Comments: | Out-of-print |
| Citation Publisher: | U.S. Fish and Wildlife Service |
| Citation Series: | Technical Paper |
| Citation Series Code: | TP |
| Citation Series Number: | 111 |
| Citation Search Results Text: | Biology, population structure, and estimated forage requirements of lake trout in Lake Michigan; 1983; Federal Government Series; TP; 111; Eck, Gary W.; Wells, LaRue |
| Citation Start Page: | 0 |
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| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Biology, population structure, and estimated forage requirements of lake trout in Lake Michigan; 1983; Federal Government Series; TP; 111; Eck, Gary W.; Wells, LaRue |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://hdl.handle.net/2027/uc1.31822009785403?urlappend=%3Bseq=3 |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Fish and Wildlife Service |
