Thiamine status of lake trout in lake Ontario and its relation to diet after the colonization of round goby, 2005–2006

Sea lamprey produced in other areas of Lake Ontario appeared to be responsible for significant levels of predation on target species of the eastern outlet basin. The life history of the lamprey is simple with only one parasitic generation present in the lake during the feeding period. Wound frequencies on gillnetted whitefish were influenced by season, fish size, gillnet set duration, and a large random error component which suggested a contagious distribution. Scar frequencies were influenced by fish age and indicated improved survival of whitefish when fish weight exceeded lamprey weight by 43 times. Lamprey impact on the whitefish stocks would probably have been more important at lower fishing intensities. The lamprey may have been prey limited, and size and species preference were probably such that lake trout and burbot were not buffered against sea lamprey by white suckers or whitefish. The analysis favored the view that lamprey were innocuous in 19th century Lake Ontario by reason of prey size and density, but climatic and other environmental effects could also have been important.Key words: sea lamprey, lake whitefish, Lake Ontario

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Survival and Development of Lake Trout Eggs and Fry in Eastern Lake Ontario — in situ Incubation, Yorkshire Bar, 1989–1993

Journal of Great Lakes Research ◽

10.1016/s0380-1330(95)71112-1 ◽

1995 ◽

Vol 21 ◽

pp. 384-399 ◽

Cited By ~ 31

Author(s):

John M. Casselman

Keyword(s):

Lake Trout ◽

Lake Ontario ◽

In Situ Incubation ◽

Survival And Development

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Sexual difference in PCB concentrations of lake trout (Salvelinus namaycush) from Lake Ontario

The Science of The Total Environment ◽

10.1016/j.scitotenv.2009.12.024 ◽

2010 ◽

Vol 408 (7) ◽

pp. 1725-1730 ◽

Cited By ~ 19

Author(s):

Charles P. Madenjian ◽

Michael J. Keir ◽

D. Michael Whittle ◽

George E. Noguchi

Keyword(s):

Sexual Difference ◽

Lake Trout ◽

Lake Ontario ◽

Salvelinus Namaycush

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Diet shift of double-crested cormorants in eastern Lake Ontario associated with the expansion of the invasive round goby

Journal of Great Lakes Research ◽

10.1016/j.jglr.2010.02.013 ◽

2010 ◽

Vol 36 (2) ◽

pp. 242-247 ◽

Cited By ~ 27

Author(s):

James H. Johnson ◽

Robert M. Ross ◽

Russell D. McCullough ◽

Alastair Mathers

Keyword(s):

Round Goby ◽

Lake Ontario ◽

Diet Shift

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Dechlorane plus monoadducts in a lake ontario (Canada) food web and biotransformation by lake trout (Salvelinus namaycush)liver microsomes

Environmental Toxicology and Chemistry ◽

10.1002/etc.2199 ◽

2013 ◽

Vol 32 (6) ◽

pp. 1376-1381 ◽

Cited By ~ 4

Author(s):

Gregg T. Tomy ◽

Ed Sverko ◽

Vince Palace ◽

Bruno Rosenberg ◽

Robert McCrindle ◽

...

Keyword(s):

Food Web ◽

Lake Trout ◽

Liver Microsomes ◽

Lake Ontario ◽

Salvelinus Namaycush ◽

Dechlorane Plus

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Feeding ecology and niche overlap of Lake Ontario offshore forage fish assessed with stable isotopes

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2016-0150 ◽

2018 ◽

Vol 75 (5) ◽

pp. 759-771 ◽

Cited By ~ 10

Author(s):

James A. Mumby ◽

Timothy B. Johnson ◽

Thomas J. Stewart ◽

Edmund A. Halfyard ◽

Brian C. Weidel ◽

...

Keyword(s):

Stable Isotopes ◽

Fish Species ◽

Round Goby ◽

Lake Ontario ◽

Niche Overlap ◽

Neogobius Melanostomus ◽

Forage Fish ◽

Isotopic Niche ◽

Ecosystem Structure ◽

Rainbow Smelt

The forage fish communities of the Laurentian Great Lakes continue to experience changes that have altered ecosystem structure, yet little is known about how they partition resources. Seasonal, spatial, and body size variation in δ13C and δ15N was used to assess isotopic niche overlap and resource and habitat partitioning among the five common offshore Lake Ontario forage fish species (n = 2037; alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), round goby (Neogobius melanostomus), and deepwater (Myoxocephalus thompsonii) and slimy (Cottus cognatus) sculpins). Round goby had the largest isotopic niche (6.1‰2, standard ellipse area), followed by alewife (3.4‰2), while rainbow smelt, slimy sculpin, and deepwater sculpin had the smallest and similar niche size (1.7‰2–1.8‰2), with only the sculpin species showing significant isotopic niche overlap (>63%). Stable isotopes in alewife, round goby, and rainbow smelt varied with location, season, and size, but did not vary in the sculpin species. Lake Ontario forage fish species have partitioned food and habitat resources, and non-native alewife and round goby have the largest isotopic niche, suggestive of a boarder ecological niche, and may contribute to their current high abundance.

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