Tag Archives: Salmon predation
Saving salmon is a ruse for breaching our dams
In the early 1990s, our small group were researching environmental claims that the lower Snake River dams were devastating salmon runs. At that time, we learned about East Sand Island, a man-made island in the estuary of the Columbia River. This island was formed from dredging deposits in 1983. And by 1984 Caspian terns, cormorants and gulls, which had colonized the island, were feasting on salmon smolts. We thought: “Wow, this is an easy fix. Tear out a man-made island and save millions of endangered fish.” The environmentalists beat us to the punch. They filed in federal court to protect the island and the birds under the Migratory Bird Treaty Act of 1918. Now we have the largest nesting colony of these non-endangered birds in the world on a man-made island. >click to read< 08:38
Sea lions take big bite out of early salmon runs
Early runs of wild spring Chinook salmon returning to the Columbia River are bearing the brunt of sea lion attacks, a new study suggests. The fish arrive in early spring before sea lions have left for summer breeding grounds and when the pinniped population is especially high at the river’s mouth. These salmon see higher mortality rates compared to later runs and the numbers have started to climb even over prior years, corresponding with a growing number of sea lions recorded near Astoria. >click to read< 08:56
