Reduction Of Mercury Concentration In Fish Through Intensive Fishing
Of Lakes: A Preliminary Testing Of Assumptions
Author(s)
N. Thérien, C. Surette, R. Fortin, M. Lucotte, S. Garceau, R. Schetagne
& A. Tremblay
Abstract
Reduction of mercury concentration in fish
through intensive fishing of lakes:
A preliminary testing of assumptions
N. ~ h ~ r i e n ] , C. surette2, R. ~ortir?, M. ~ucotte~, S. ~ a r c e a u ~ ,
R. schetagne3 & A. ~ r e r n b l a ~ ~
I Facultk de gknie, UniversitL de Sherbrooke, Canada
2~niversitL du Qukbec a Montrkal, Canada
3 Department of Hydraulics and Environment, Hydro-QuLbec, Canada
Abstract
Intensive fishing of lakes has been indicated in the literature as a means of reducing
mercury concentrations in fish. However, the controlling process by which this
occurs remains unclear. Three assumptions are generally put forward to explain the
reduction. The first is that intensive fishing would affect the total mercury balance of
the lake and reduce the mercury bioaccumulation in fish. The second is that the fish
diet would be affected, especially for piscivorous fish feeding on smaller prey fish
with lower mercury concentration following intensive fishmg of larger prey fish. The
third assump
Keywords
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