SCUBA divers can collect fish and marine mammal DNA just by swimming! A few years ago, we reported on an exciting collaboration with scientists from Scripps Oceanography that uses cutting-edge technology to improve our understanding of ocean ecosystems. Results from this study were recently published in the scientfic journal, Environmental DNA.
This study tested whether citizen science SCUBA divers could help monitor marine biodiversity using environmental DNA (eDNA), or tiny genetic traces organisms leave behind in seawater. eDNA filters were attached to REEF volunteer divers, who concurrently conducted REEF Volunteer Fish Survey Project surveys. The DNA captured on those filters was then extracted and sequenced, and the species detected were compared to what divers recorded visually during their surveys.
Accurate underwater visual census (UVC) of fish community structure is essential for monitoring ecosystem health, managing fisheries, and evaluating response to stressors on coral reefs. However, comparisons between survey methods often reveal significant differences in species detection and estimated density.
Introducing our April Fish of the Month, the Red Lionfish, Pterois volitans! We chose this species because April is Lionfish Derby month — REEF's 17th Annual Florida Keys Lionfish Derby & Arts Festival takes place April 23–26, 2026, right here in Key Largo!
REEF's sixth annual Give BIG for the Oceans is coming on Friday, April 17, 2026 — and we want you to be part of it!
On April 17, every dollar you give will be matched dollar for dollar — up to $30,000 — thanks to a generous anonymous donor. This is a one-day-only event to support REEF's ocean conservation, citizen science, and education programs. Your support ensures that these programs continue to protect marine life and inspire action worldwide.
Our online programs are free and open to all! Check out what's coming up, and view the entire schedule of Fishinars and other online programs here.
REEF Into the Blue Book Club
Thursday, April 9, 8pm EDT
Click here to register
It's Derby month! Join us as we gear up for an exciting week of conservation, invasive species removal, and artistic fun! The Florida Keys Lionfish Derby & Arts Festival combines local art, conservation science, and education all into one, can't-miss event! Here's an idea of what to expect:
April 23 – Kick-off Party & Captain's Meeting (5–7:30 PM)
Students from Ransom Everglades School recently teamed up with the REEF Ocean Explorers program for an unforgettable hands-on marine science experience. The day began with an interactive classroom session at the Ocean Exploration Center where students learned the fundamentals of Caribbean tropical fish identification, including how to recognize key features, understand reef habitats, and use REEF survey materials to document marine life.