Wiener, J. G., Martini, R. E., Sheffy, T. B., and Glass, G. E., 1990, Factors
influencing mercury concentrations in walleyes in northern Wisconsin lakes:
Transactions of the American Fisheries Society, v. 119, no. 5, p. 862-870.

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.

Keywords:

lakes, bioaccumulation, pollution-effects, pH-effects, heavy-metals, Wisconsin,
Stizostedion-vitreum, USA,-Wisconsin, mercury-