The Humane Society of the United States has filed a complaint in federal court, hoping to block plans to kill sea lions on the Columbia River to protect salmon. Sharon Young with the society says the public was not given an opportunity to respond to the decision made by the National Marine Fisheries Service last week to allows the killings. Young says new scientific studies indicate the sea lions are not the biggest threat to the salmon population; that stocking the river with non-native fish may be a bigger problem. Recent efforts to haze the sea lions on the Columbia and Willamette have not been effective. The Humane Society of the U.S. is not affiliated with the Oregon Humane Society.