December 4, 2025 — The U.S. House Water, Wildlife, and Fisheries Subcommittee held a hearing on sea lion predation on salmon and the effectiveness of killing the mammals to slow down the trend.
Under the Marine Mammal Protection Act (MMPA), sea lions skyrocketed from a population of roughly 10,000 in the 1950s to 250,000 today. That spike has been seen as a success story for the MMPA, but it’s also had a major impact on salmon populations, which are a key food source for pinnipeds. By traveling upriver to avoid their natural predators – orcas – sea lions are able to feast on already struggling salmon populations. Since 2002, California and Steller sea lions have eaten roughly 98,000 salmon at just two sites: Bonneville Dam and Willamette Falls, Oregon.