The Potomac River has been long polluted and government agencies have taken steps to clean it up, making the lamprey's appearance a sign that the pollution is finally ebbing away because the creature is sensitive to toxins.
'The resurgence of sea lamprey is another indication that water quality is getting better,' Jim Cummins, the then-associate director for the Living Resources Section told the Potomac Bay Reporter at the time. 'Sea lamprey are fairly sensitive to pollution.'
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