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NOAA Photo Library Image - fizh0137

Lowering Secchi disk to determine relative turbidity (amount of suspended sediment) in the water. The depth at which the disk is no longer visible can be related to the amount of suspended material in the water.

Image ID: fizh0137, NOAA's Historic Fisheries Collection
Location: Alaska Southeast
Photo Date: 1960 circa
Photographer: J. Olson BCF
Credit: NOAA Central Library Historical Fisheries Collection

High Resolution Photo Available

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Last Updated:
November 10, 2017