Underwater writing slates were used to record the different species adhering to the top, side and interior roof of pipes over time. Counting the interior surface of pipes took considerable flexibility on the part of the diver.

Image ID: reef0159, NOAA's Coral Kingdom Collection
Location: Pokai Bay, Oahu
Photo Date: August 1969
Photographer: Dr. James P. McVey, NOAA Sea Grant Program


Category: Coral Reefs/Marine Biologist/Artificial Reef/Diving/

• High Resolution Photo Available