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NOAA Photo Library Image - fizh1734

Biological research - tagged stones. Tagged stones were regularly examined to determine the number of aquatic insects important as fish food. Records of insect abundance before and after the stream watershed has been sprayed with DDT enabled BCF biologists to evaluate the effect of pesticides on fish populations.

Image ID: fizh1734, NOAA's Historic Fisheries Collection
Location: Alaska, Prince of Wales Island
Photo Date: 1962 circa
Credit: NOAA Central Library Historical Fisheries Collection

High Resolution Photo Available

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Last Updated:
June 10, 2016