Survey of four essential nutrients and thiaminase activity in five Lake Ontario prey fish species

2012 ◽  
Vol 38 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Dale C. Honeyfield ◽  
Marion E. Daniels ◽  
Lisa R. Brown ◽  
Michael T. Arts ◽  
Maureen G. Walsh ◽  
...  
Keyword(s):  
Fish Species ◽  
Lake Ontario ◽  
Prey Fish ◽  
Essential Nutrients

Ecological tracers reveal resource convergence among prey fish species in a large lake ecosystem

2014 ◽  
Vol 59 (10) ◽  
pp. 2150-2161 ◽  
Author(s):  
Gord Paterson ◽  
Scott A. Rush ◽  
Michael T. Arts ◽  
Ken G. Drouillard ◽  
Gordon Doug Haffner ◽  
...  
Keyword(s):  
Fish Species ◽  
Lake Ecosystem ◽  
Large Lake ◽  
Prey Fish

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

2018 ◽  
Vol 75 (5) ◽  
pp. 759-771 ◽  
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.

scholarly journals Modelling the effects of different quality prey fish species and of food supply reduction on growth performance of Roseate Tern chicks

2004 ◽  
Vol 177 (1-2) ◽  
pp. 95-106 ◽  
Author(s):  
Irene Martins ◽  
José Costa Pereira ◽  
Jaime A. Ramos ◽  
Sven Erik Jørgensen
Keyword(s):  
Growth Performance ◽  
Fish Species ◽  
Food Supply ◽  
Prey Fish ◽  
Supply Reduction ◽  
Roseate Tern

Prey fish exploitation, salmonine production, and pelagic food web efficiency in Lake Ontario

1998 ◽  
Vol 55 (2) ◽  
pp. 318-327 ◽  
Author(s):  
Peter S Rand ◽  
Donald J Stewart
Keyword(s):  
Food Web ◽  
Lake Michigan ◽  
Oncorhynchus Tshawytscha ◽  
Lake Trout ◽  
Coho Salmon ◽  
Lake Ontario ◽  
Osmerus Mordax ◽  
Prey Fish ◽  
Rainbow Smelt ◽  
Time Model

Estimates of production and predation rates from bioenergetic models of chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), and lake trout (Salvelinus namaycush) suggest a long-term decline in their gross conversion efficiency (gross production/prey consumption) and the gross production to biomass ratio in Lake Ontario during 1978-1994. The former pattern was caused primarily by a declining trend in adult alewife (Alosa pseudoharengus) energy density during 1978-1985; the latter pattern resulted from reductions in growth rates (coho salmon) and a buildup of the older age-classes in the population (lake trout) over time. Model results suggest that over 100 and 25% of the annual production of adult alewife and rainbow smelt (Osmerus mordax), respectively, was consumed by salmonines during 1990 in Lake Ontario; hence, we claim that recent observations of reduced salmonine growth in Lake Ontario may be a result of prey limitation. Energy transfer from primary production to salmonines appeared to be more efficient in Lake Ontario than in Lake Michigan, probably due to higher stocking levels per unit area and higher densities of preferred prey fish in Lake Ontario. Through separate analyses, we arrived at conflicting conclusions concerning the sustainability of the food web configuration in Lake Ontario during 1990.

Egg Fatty Acid Composition from Lake Trout Fed Two Lake Michigan Prey Fish Species

2009 ◽  
Vol 21 (4) ◽  
pp. 272-278 ◽  
Author(s):  
Dale C. Honeyfield ◽  
John D. Fitzsimons ◽  
Donald E. Tillitt ◽  
Scott B. Brown
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fish Species ◽  
Lake Michigan ◽  
Lake Trout ◽  
Prey Fish

scholarly journals Methylmercury bioaccumulation in sport fish and the relation to human exposure

2021 ◽  
Author(s):  
Wai Ching (Amy) Au-Yeung
Keyword(s):  
Fish Species ◽  
Mercury Level ◽  
Lake Ontario ◽  
Predatory Fish ◽  
Cooking Methods ◽  
Minimal Risk ◽  
Sport Fish ◽  
Excellent Tool ◽  
Fish Contamination ◽  
Methylmercury Bioaccumulation

A long-lasting contaminant, methylmercury (MeHg), builds up in human bodies over a lifetime. Regularly eating contaminated fish may accumulate mercury to an amount that raises health concerns, especially for children and babies. Methylmercury is found throughout the parts of the fish that are eaten; cleaning or cooking methods cannot effectively reduce mercury exposure. The main focus of this thesis concerns the fish contamination in Lake Ontario and to conserve health from eating contaminated sport fish. Although mercury (Hg) is tightly regulated, mercury levels in fish still gradually increase throughout their life spans. Through the field data provided by the Ontario Ministry of Environment (MOE), greater amounts of methylmercury are found in older fish and predatory fish that eat other fish as part of their diet. A bioenergetics computer program, called Generic Bioaccumulation Model (BGM) (Luk, 1996), simulating the bioaccumulation of Hg in fish was applied to provide a good estimation of mercury levels for different species. It is an excellent tool in predicting the trends and magnitude of mercury levels among six sport fish in Lake Ontario. In addition, an estimation of human mercury consumption from fish was also developed. In most of the fish species, there is minimal risk to humans when eating fish less than two times a week. The species Walleye (Stizostedion vitreum) and its quality and quantity are of greatest concern, since it exhibits the highest mercury level among the six sport fish species.

Effects of Abiotic Disturbance on Coexistence of Predator-Prey Fish Species

Ecology ◽  
1984 ◽  
Vol 65 (5) ◽  
pp. 1525-1534 ◽  
Author(s):  
Gary K. Meffe
Keyword(s):  
Fish Species ◽  
Prey Fish ◽  
Predator Prey
Sign in / Sign up

Export Citation Format

Share Document