October 18, 2018 — Used to be, they’d show up at Willamette Falls around late November—beefy males here to bulk up and loll on the docks. Call it sea lion winter break; time off from California’s Channel Islands rookeries, beaucoup steelhead to eat, zero problems. (No pups, no ladies, no predators.) When it was time to head back south, a 400-pound sea lion might have doubled in size, having chowed down on, at minimum, three 15-pound Pacific Northwest salmonids a day.
Nowadays, these party boys are arriving earlier and staying later. And they’re not just loitering in Oregon City. They also mob the Columbia River, particularly around January, for chinook on their way to spawning grounds—eating, by one report, as much as 45 percent of some salmon runs, a feast season that now draws out through June.
“They’ve learned that in April and May there’s a pretty good buffet,” says Robert Anderson, a fishery biologist at the National Oceanic and Atmospheric Administration. “Particularly over the past four to five years, there’s been a good uptick in the California sea lions that go to Willamette Falls.”
The result, warned Oregon’s Department of Fish & Wildlife in a 2017 study, is a 90 percent chance some of the Columbia River’s already struggling salmon populations will soon go extinct. And that’s causing some Northwest legislators to take aim at sea lions.
The irony here? Both species are protected by federal law—salmon (steelhead, chinook) by the 1973 Endangered Species Act and sea lions (California and Steller’s) by the 1972 Marine Mammal Protection Act. That means state, federal, and tribal agencies’ hands are tied when it comes to lethally removing hungry sea lions from river systems—like the mid-Columbia—where historically they’ve never been. According to Charles Hudson of the Columbia River Inter-Tribal Fish Commission, that’s the choice we have to make: do we kill one species to save another?