http://www.kqed.org/.stream/anon/radio/quest/2011/04/2011-04-18-quest.mp3
Hundreds of invasive species have been found in San Francisco Bay, one of the most invaded estuaries in the world. Hoping to restore native fish and wildlife, California has passed the strictest rules in the nation to prevent ocean freighters from introducing more foreign species to the bay. But as Lauren Sommer reports, the standards are so tough, officials may not be able to enforce them.