Naylor and her coauthors conclude that, despite some efforts by aquaculture companies to curtail farm salmon escapes—such as using stronger net materials—the efforts are inadequate, as monitoring and enforcement of regulations governing escapes are weak. An estimated two million farm Atlantic salmon escape each year into the North Atlantic, and millions more have escaped on the western coasts of North American and South America. Farm Atlantic salmon are more aggressive and faster-growing than native fish, with which they compete for food.