In this Globe and Mail article, yet another suggestion that exposure to in-river contaminants may be a factor in the survival of Fraser River salmon:
Among the endocrine disrupting ingredients identified in the Fraser were industrial chemicals, pesticides, compounds with a carbon-metal bond, pharmaceuticals and “several estrogen-like compounds,” the report says.
It states that data are insufficient to evaluate the impact of endocrine-disrupting compounds, but notes reports from First Nation fishermen that salmon are smaller on average, increasingly have blotchy skin and of one male sockeye that had ovaries, are cause for concern.