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NOAA Photo Library Image - fizh1772

Force-feeding of radioactive pellets to fingerling salmon. This was done to study the rates of metabolism of various trace elements introduced orally. Special diet pellets containing standardized amounts of radioisotopes of the trace elements to be studied are loaded into a special feeding tube, the fish anesthesized, and the pellet forced down by a plunger.

Image ID: fizh1772, NOAA's Historic Fisheries Collection
Credit: NOAA Central Library Historical Fisheries Collection

High Resolution Photo Available

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Last Updated:
November 10, 2017