Abstract
The difficulties in assessing the effects of water pollution on a salmon fishery are illustrated with the example of pollution in the lower Fraser River and the Chilko run of sockeye salmon. Changes in water quality in the lower Fraser affect the salmon as they migrate to sea as smolts and as they return to spawn. A procedure is presented for making a preliminary assessment of the effect of additional mortality induced by water quality changes on the average size of the run; ways of extending the analysis to estimate probable trends in water quality and the effects this would have on the salmon fishery are outlined.
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