Fishery managers from Oregon and Washington have adopted additional fishing days, beginning Thursday, for recreational spring Chinook salmon in the Columbia River downstream of Bonneville Dam.  This additional opportunity is based on a projected return of 161,800 upriver-origin adult spring Chinook.  The updated projection exceeds the preseason forecast of 122,900 adult fish and is slightly higher than the recent 10-year average return of these fish.  The specific season dates are from Thursday to May 22, and June 4 to June 15.  The bag limit is two adult hatchery Chinook or steelhead per day, but only one may be a Chinook.  Shad may also be retained.  The open area is from the Tongue Point/Rocky Point line upstream to Beacon Rock, plus bank angling only from Beacon Rock upstream to the Bonneville Dam deadline.  Fishery managers scheduled another hearing for next Wednesday to consider the latest information on catch rates and determine if additional fishing days can be added.