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Study: Chinook salmon are key to Northwest orcas all year

Study: Chinook salmon are key to Northwest orcas all year Gene Johnson SEATTLE  For more than a decade, Brad Hanson and other researchers have tailed the Pacific Northwest s endangered killer whales in a hard-sided inflatable boat, leaning over the edge with a standard pool skimmer to collect clues to their diet: bits of orca poop floating on the water, or fish scales sparkling just below the surface. Their work established years ago that the whales depend heavily on depleted runs of Chinook, the largest and fattiest of Pacific salmon species, when they forage in the summer in the inland waters between Washington state and British Columbia.

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