(Portland, OR) -- The Oregon Health Authority is warning residents about eating sturgeon caught in the lower Columbia and Willamette Rivers. Tests show the fish contain potentially carcinogenic PCBs. Sturgeon live long and eat from the bottom of the river, where PCBs settle. OHA says sturgeon caught in the lower Columbia River aren't as contaminated, so seven to eight meals per month are allowable. Sturgeon caught in the lower Willamette River are more contaminated, and only one meal per month is recommended.