Secchi disc readings were used to determine turbidity at the reef site on a regular basis

Secchi disc readings were used to determine turbidity at the reef site on a regular basis. The rope was marked at five foot intervals to determine at what distance the disc could no longer be seen on a horizontal axis.

Photo Category: Coral Reefs - Marine Biologist - Artificial Reef - Diving
Photo Location: Pokai Bay, Oahu
Photo Date: June 1969

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Author: Dr. James P. McVey, NOAA Sea Grant Program/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	19th October 2015
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