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National Park ServiceAlagnak River Segment
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When spawning, male sockeye salmon develop a brilliant red color and distinctive hump.  

Did You Know?
Each summer, the five species of Pacific salmon return to their birthplace in the Alagnak Wild River to spawn and die. As they migrate upstream by the hundreds of thousands, they undergo incredible morphological changes. Male sockeye salmon turn a brilliant red and develop a distinctive humped back.

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Last Updated: July 24, 2006 at 22:37 EST