Uptake of Mercury by Caged Rainbow Trout (Salmo gairdneri) in the South Saskatchewan River

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Abstract
Rainbow trout (Salmo gairdneri) were held in cages in the South Saskatchewan River to assess mercury uptake following curtailment of mercury discharges to the river. There was a rapid uptake of mercury by the fish during the first warm summer period (1970) with much less uptake during the rest of the year. A second summer experiment (1971) produced no significantly different results suggesting that a long-term contamination exists within this river system. Analyses showed that the bulk of mercury present in the fish carcasses was present as methylmercury.