Retention of Chinook salmon in the popular Buoy 10 fishery on the Columbia River closed Friday after higher-than-expected catch rates and mortality of an important Chinook stock.

Impacts on lower river natural tule Chinook is managed under strict guidelines and can define how the fishery progresses. Buoy 10 fishermen are allowed only a certain portion of impacts on this stock for the summertime fishery.

Chinook retention opened on Aug. 1 and was scheduled to run through Sept. 6, but catch rates and angler effort has been relatively high since Aug. 11, according to fishery managers. Environmental conditions may have also been a factor, however. Higher temperatures upstream may have caused Chinook to stay in the estuary.

Fishery managers in Oregon and Washington state continue to allow anglers to retain hatchery coho salmon from the Buoy 10 line to the Tongue Point-Rocky Point line.