Federal draft report: Delta system imperils fish

Salmon, steelhead and sturgeon in the Central Valley are being driven to extinction by Delta pumping systems and upstream reservoir operations, according to a draft federal report. The National Marine Fisheries Service has not yet released the report, but it was discussed at a meeting of scientists in Sacramento on Thursday. The impacts are so significant that the agency is also studying whether killer whales in the ocean could be imperiled by declining Central Valley salmon, their primary prey. The grave findings suggest that California's efforts to serve thirsty farms and cities while sustaining healthy fisheries will only get more difficult. A final version of the report, called a biological opinion, is expected by March 2. The Endangered Species Act empowers the fisheries service to impose new rules on state and federal water systems to protect the fish....