| methylmercury in fish from owyhee reservoir in southeast oregon: scientific uncertainty and fish advisories. | data collected during 1987-1994 showed elevated levels of mercury (hg) in fish tissue from the owyhee reservoir in southeastern oregon. sixty-five percent of the samples analyzed had total hg levels exceeding the us environmental protection agency's (epa) health screening value of 0.6 mg/kg. eighteen out of 89 (20%) fish tissue samples also had total hg levels greater than the us food and drug administration's (fda) mercury action level of 1.0 mg/kg. the overall mean hg content for all fish coll ... | 1997 | 9335158 |