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The effects of feeding ecology on mercury accumulation in walleye
(Stizostedion vitreum ) and pike (Esox lucius ) in Lake Simcoe.
Mathers, RA | Johansen, PH
Canadian Journal of Zoology/Revue Canadienne de Zoologie [CAN. J.
ZOOL.]. Vol. 63, no. 9, pp. 2006-2012. 1985.
In Lake Simcoe, mercury was accumulated by walleye to a greater
maximum concentration (2700 ng g super(-1)) and at a faster rate
(119 ng g super(-1) year super(-1)) than pike (maximum
concentration, 850 ng g super(-1); rate, 78 ng g super(-1)year
super(-1)). Field studies showed that relative to pike, the total
diet of walleye was more highly mercury contaminated primarily
because it contained a higher proportion of smelt, the most highly
contaminated prey for either predator. Additionally, as walleye
and pike became older, their prey became larger and the species
composition changed. Consequently, as they grew older, the diet of
these predators contained more mercury. Bioenergetic equations
predicted that on an age-specific basis, walleye had a higher food
consumption rate (grams of food per gram of fish per year) than
pike and thus are predicted to consume more mercury with their
diet than pike. This study supports the hypothesis that the diet
of feral fish has a strong influence on the accumulation of
mercury.
 Descriptors: Article Subject Terms bioaccumulation | diets | feeding | freshwater
pollution | mercury | Article Taxonomic Terms Esox lucius | Stizostedion
vitreum | Article Geographic Terms Canada, Ontario, Simcoe L.
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