Since 1993, volunteer divers have been recording the fish they encounter for the American REEF program. In 2024, its database exceeded 300,000 surveys conducted at nearly 18,000 sites by more than 17,000 participants. These records are used by NOAA, the State of Florida, and marine park managers.
This is what a citizen diver looks like. Someone who dives for pleasure and, in the process, produces useful data or prevents damage.
Here we sort out what truly helps and what is just good intention, with programs verified on October 3, 2026.
What can a citizen diver really contribute?
Three contributions, in this order: not damaging what they visit, producing observations usable by scientists, and removing debris according to a protocol. The rest, like sharing photos or spreading a message, also counts, but its effect is hard to measure. We keep that as a bonus.
The first point seems obvious.
Yet, most damage caused by divers comes from unintentional contact: a fin scraping, a hand resting, a pressure gauge dragging on the bottom. Good buoyancy therefore protects the reef better than a one-time action. It’s less photogenic. It also doesn’t show up on social media. Scientific data, on the other hand, requires rigor more than talent, because an observation without date, location, or depth is almost useless to a researcher wanting to track a population over time.
In short, a useful citizen diver is first and foremost a discreet diver.
How to participate in a citizen science program?
Choose a program that publishes its protocol and states who the data serves. REEF, in the United States and the Caribbean, counts fish by species during the dive. In France, the FFESSM offers BioObs to record observations, and the DORIS database helps identify the fauna and flora of our coasts.
The protocol matters more than the camera.
A useful record contains the date, exact location, depth, and species name, given cautiously when uncertain. A photo taken without disturbing the animal then allows a specialist to validate or correct. Noting that nothing was seen also has value when the protocol requires it, because repeated absence at a site monitored for years can indicate a change that no one would have noticed otherwise. Beginners have their place here. REEF states on its page: everyone can participate, with scuba, freediving, or snorkel.
Be careful with identification. Confusing two close species distorts a distribution map, so it’s better to write “indeterminate grouper” than a guessed species name.
What is a cleanup dive for?
It removes debris, but its main interest lies in counting. The Dive Against Debris program, launched by PADI in 2011, asks divers to sort, count, and report what they collect. The PADI AWARE Foundation presents the resulting database as the largest underwater citizen science database in the world.
Picking up without recording is losing half the work.
However, a cleanup dive remains a dive, with its limits. It is prepared with the club, setting depth, duration, and who carries the bag. A ghost net caught on the reef cannot be removed alone or barehanded, as it can entangle a diver, and the safest approach is to note its position then report it to the club or local authorities. Sharp debris stays in place without suitable gloves. Coral that has grown on an old tire too.
To join an action near you, our guide to cleanup dives and local ecological projects details the steps.
Green Fins, GSTC, PADI AWARE: what are these labels worth?
They do not measure the same thing. Green Fins, supported by the Reef-World Foundation and the United Nations Environment Programme since 2004, evaluates diving and snorkeling centers based on 15 environmental conduct rules. The GSTC, on the other hand, sets sustainable tourism criteria and accredits certification bodies.
Green Fins remains the most concrete for a diver. Its certified members, more than 700 operators since the launch according to the program’s website, receive a bronze, silver, or gold ranking after evaluation. The rules target specific practices such as anchoring on the reef, feeding fish, or chemical pollution. The rank can also drop. PADI AWARE, for its part, is a foundation that funds and coordinates programs like Dive Against Debris or Adopt the Blue, and the “PADI Conscious” mentioned in the previous version of this article does not correspond to any label that we could find.
Thus, a logo on a storefront says nothing about the date of the last evaluation.
Ask for it. A serious center answers straightforwardly, and if it hesitates, that is already information.
What actions protect the reef during diving?
Buoyancy first, then distance. A well-weighted diver who keeps their fins above the bottom and their accessories attached avoids most accidental contacts with the reef. Also leave shells and animals where they are, and keep the food for yourself.
The reasons are detailed in our article on why you should never touch marine life.
But sunscreen divides opinion more. Laboratory studies have implicated filters like oxybenzone, and territories like Hawaii or Palau have banned some, without the real effect on an open reef being as clear-cut as the “reef safe” labels suggest. The simplest remains a lycra suit, which protects without releasing anything. We admit, it is less pleasant at 30 °C. For filters and brands, our report on sunscreen and marine environments takes stock.
For choosing the club, our guide to eco-responsible diving lists the questions to ask before booking.
How much time and money does the commitment require?
Little money, a bit of time, and above all regularity. The citizen science programs mentioned here are free for the diver, and an observation sheet can be filled out in a few minutes after the dive if you took notes on your slate. Specialized training courses, however, are paid, at a price set by each club.
The real cost is attention.
And it is paid during the dive. Counting fish or noting debris occupies part of your mind that until then was monitoring your air, depth, and buddy. For a recent diver, this sharing is no small matter. So start with easy and shallow dives, with an instructor who knows the protocol, and keep the counting for when basic safety no longer requires conscious effort. Warn your buddy beforehand.
For the educational aspect, see how to raise awareness about ecology through diving, or how underwater ecotourism links travel and commitment.
The real cost boils down to two lines: a few minutes of data entry after each outing, and a bit of concentration taken from your dive, to be adjusted according to your level.
FAQ
Is a specific level required to participate in citizen science in diving?
No. REEF opens its program to scuba divers, freedivers, and snorkelers. The level mainly matters for your safety: as long as managing your air and buoyancy requires your attention, keep the counting for easy and supervised dives.
Does Green Fins guarantee that a dive center is eco-friendly?
It indicates that a center has been evaluated on 15 environmental rules and ranked bronze, silver, or gold. Ask for the date of the last evaluation, as an old ranking says little about current practice.
Can you remove an abandoned fishing net alone?
Better to avoid it. A net can entangle a diver and damage the reef if pulled. Note its position, take a photo if possible without risk, and report it to the club or local authorities.
Where to enter your diving observations in France?
The FFESSM offers the BioObs tool to record observed species, and the DORIS database helps identify them. Note the date, location, and depth, and attach a photo when you have one.
Sources
- About Green Fins (The Reef-World Foundation and UNEP, accessed in 2026)
- Volunteer Fish Survey Project | Reef Environmental Education Foundation (REEF, 2024)
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