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![Technician at the BCF Ann Arbor Biological Laboratory determines concentrationof pesticides in samples of river and lake water fish7938.jpg Technician at the BCF Ann Arbor Biological Laboratory determines concentrationof pesticides in samples of river and lake water](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish7938.jpg?itok=PKVZtRAL)
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Technician at the BCF Ann Arbor Biological Laboratory determines concentrationof pesticides in samples of river and lake water. More study is needed toidentify toxic substances that may be dangerous or lethal to aquatic life andhumans when contaminated food is eaten. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 350 of Our Changing Fisheries 1970 Centenary NMFS centenary volume)