Sea Lions Feasting on First Chinook Salmon Arriving at Columbia River
A study from the University of Washington and NOAA Fisheries has found that sea lions are having the biggest negative impact on early-arriving Chinook salmon in the lower Columbia River.
Sea lions have learned to swim upriver to get an easy meal of migrating salmon by the Bonneville Dam, the University explained.
"We investigated whether mortality rates varied depending on the specific threatened Chinook salmon population, determined by when they arrive in the river," said lead author Mark Sorel, a doctoral student at the UW School of Aquatic and Fishery Sciences...
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