Upstream Battle: What Is Killing Off the Fraser River's Sockeye Salmon? [Slide Show]

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Gridlocked bridges over the Fraser River are just a part of life for commuting Vancouverites. But the industrialized motif of North America's longest dam-free river belies a rare natural treasure: a sockeye salmon run with a historical average of eight million fish worth over $1 billion. Since the early 1990s the numbers of Fraser sockeye have steadily dwindled, reaching a particularly troublesome nadir in 2009 when more than 11 million sockeye were forecast to return and only 1.4 million showed up. Since the mid-1990s, something began killing large numbers of returning sockeye on the Fraser--anywhere from 40 to 95 percent of fish in some years--before they could spawn. [More] (http://www.scientificamerican.com/article.cfm?id=what-is-killing-off-fraser-river-sockeye-salmon)

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