pl23_fizh1772.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23fizh1772jpgDescription
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.
Credit
NOAA Central Library Historical Fisheries Collection
Collection
Historic Fisheries