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Factors influencing mercury concentrations in walleyes in northern Wisconsin lakes

Transactions of the American Fisheries Society

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Abstract

The authors examined relations between mercury concentrations in walleyes Stizostedion vitreum and the characteristics of clear-water Wisconsin lakes, which spanned a broad range of pH values (5.0-8.1) and acid- neutralizing capacities (-9 to 1,017 mu eq/L). Total concentrations of mercury in axial muscle tissue of walleyes (total length, 25-56 cm) varied from 0.12 to 1.74 mu g/g wet weight. Concentrations were greatest in fish from the eight lakes with pH less than 7.0; concentrations in these fish equaled or exceeded 0.5 mu g/g in 88% of the samples analyzed and 1.0 mu g/g in 44%. In the five lakes with pH of 7.0 and above, concentrations exceeded 0.5 mu g/g in only 1 of 21 walleyes. Multiple regression revealed that lake pH and total length of fish accounted for 69% of the variation in mercury concentration in walleyes. Regression models with total length and either waterborne calcium or acid-neutralizing capacity as independent variables accounted for 67% of the variation in concentration.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Factors influencing mercury concentrations in walleyes in northern Wisconsin lakes
Series title:
Transactions of the American Fisheries Society
Volume
119
Issue:
5
Year Published:
1990
Language:
English
Publisher:
U.S. Fish and Wildlife Service
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 862-870
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
862
Last page:
870
Number of Pages:
9