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Why are the PCB concentrations of salmonine individuals from the same lake so highly variable?

Canadian Journal of Fisheries and Aquatic Sciences

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Abstract

An individual-based model (IBM) was applied to the Lake Michigan rainbow trout (Oncorhynchus mykiss) population, with the objectives of explaining the observed variation in growth and in polychlorinated biphenyl (PCB) concentration within the population. When variation in prey PCB concentration was incorporated into the model, variability in PCB concentration among individual rainbow trout was fully explained by the IBM. Although number of spawnings and number of years spent in a stream prior to first entering the lake were factors in determining growth, these life history characteristics appeared to have only a minor impact on PCB accumulation rate in rainbow trout. The IBM application to the rainbow trout population was compared with an application to the Lake Michigan lake trout (Salvelinus namaycush) population. Modeling results indicated that the lower observed PCB concentrations in rainbow trout compared with lake trout were chiefly due to greater longevity in lake trout. The IBM simulations identified gross growth efficiency, assimilation efficiency of PCBs from food, and diet as other important sources of variability in salmonine PCB concentrations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Why are the PCB concentrations of salmonine individuals from the same lake so highly variable?
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
Volume
51
Issue:
4
Year Published:
1994
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 800-807
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Fisheries and Aquatic Sciences
First page:
800
Last page:
807
Number of Pages:
7