Here’s how to use DNA to find elusive sharks
Genetic traces in seawater reveal an unseen ‘dark diversity’ that divers and cameras miss
![shark](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/05/050318_sm_shark_feat.jpg?fit=860%2C460&ssl=1)
SHARK SIGNS A baited camera lures a tiger shark and gray reef shark into view, as part of a test to compare what works better to census the elusive fishes: cameras, divers or collecting DNA from seawater.
Laurent Vigliola/IRD