Abstract of Kelly, T.M., J.D. Jones, and G.R. Smith. 1975. Historical changes in mercury contamination in Michigan walleyes (Stizostedion vitreum vitreum). J. Fish. Res. Bd. Canada 32:1745-1754.

High levels of mercury contamination were found on Isle Royale, Saginaw Bay, and Western Lake Erie. Some 1970s mercury concentrations in great lakes walleyes were higher than those early in the century except on Isle Royale, where natural mercury from the metamorphic rocks cause high hg levels. Assay of preserved tissue requires correction for 30% weight loss in alcohol.