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![Force-feeding of radioactive pellets to fingerling salmon fizh1772.jpg Force-feeding of radioactive pellets to fingerling salmon](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fizh1772.jpg?itok=dCxdR3W-)
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Force-feeding of radioactive pellets to fingerling salmon. This was done tostudy the rates of metabolism of various trace elements introduced orally.Special diet pellets containing standardized amounts of radioisotopes of thetrace elements to be studied are loaded into a special feeding tube, the fishanesthesized, and the pellet forced down by a plunger. (Image credit: NOAA Central Library Historical Fisheries Collection)