The second chart shows the concentrations of five metals in sturgeon flesh. The highest values for lead and arsenic were above the national average and indicate some cause for concern. The third chart shows the concentrations of four metals in the livers of otters as compared with a reference group from the region. The concentrations measured in lower Columbia River otters were not greatly different from those in the reference group. Much has been done by the private sector and government to reduce metals concentrations.
More work is needed.