Fishery managers from Oregon and Washington extended Chinook retention on the mainstem Columbia River for two additional weeks during a joint state hearing Wednesday.  The decision came after fishery managers assessed harvest in the fall season fisheries and considered the in-season abundance expectations for upriver salmon and steelhead stocks.  From West Puget Island to the Highway 395 Bridge at Pasco, Chinook retention will remain open through October 13 with a daily adult bag limit of two salmon, Chinook or coho, but only one may be a Chinook.  Hatchery coho only is allowed downstream of the Hood River Bridge; all wild coho caught in this area must be released.  From Buoy 10 to west Puget Island, Chinook retention will now remain open in the Buoy 10 fishery through October 13 with a daily adult bag limit of three salmon, Chinook or hatchery coho, but only one may be a Chinook.  Between October 14 and October 31, three adult hatchery coho can be retained daily but Chinook must be released.