A mature female sockeye salmon swims up to 5,000 km from her Pacific Ocean feeding ground to the mouth of a coastal river in British Columbia and then another 1,000 km upstream to her spawning ground. Once there, she lays thousands of eggs in her single reproductive event and promptly dies. The salmon's reproductive life history is

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Semelparous refers to organisms that reproduce just once and then die, which is the case with the female sockeye salmon.

A Mature Female Sockeye Salmon Swims Up to 5,000 Km