Underwater visual survey
![](https://eatlas.org.au/sites/default/files/styles/m_very_large/public/shared/nerp-te/8-2/254_8.2%20image%201.jpg?itok=LoR4idnz)
© courtesy David Williamson
Description
Diver conducting underwater visual surveys of reef fishes on the Great Barrier Reef.
Diver conducting underwater visual surveys of reef fishes on the Great Barrier Reef.