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Scientists continue to search for clues about a mysterious ailment that has yet to be identified, and which appears linked to staggering death rates among adult salmon.

John Lehmann/The Globe and Mail

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Timber Whitehouse, Area Chief Fraser River Stock Assessment , opens up a dead sockeye salmon looking for evidence of pre-spawn mortalities, a phenomenon that sometimes kills up to 50 per cent of stock before the fish have spawned.

John Lehmann/The Globe and Mail

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For two decades, the Fraser River’s sockeye population has been steadily dwindling, leading to a catastrophic collapse in 2009, when only one million fish returned, instead of the 10 million expected.

John Lehmann/The Globe and Mail

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A DFO technician takes scale and otoliths samples from dead sockeye salmon in the Adams River. The otoliths are small white structure sfrom which they can gain information about the age and growth of fish.

John Lehmann/The Globe and Mail

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The task of the Cohen Commission has been compared to Agatha Christie's Murder on the Orient Express Judge Cohen is faced with so many confusing clues and so many suspects.

John Lehmann/The Globe and Mail

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