Fish identification app for scuba divers

From a dive photo to a useful shortlist

Marine Species ID is for divers, snorkellers and underwater photographers who want to learn more about an encounter. A fish identifier is most useful when it gives you reasons for a match, rather than just a name. Use the existing upload tool above to provide the photo, then read the result alongside what you remember from the dive.

A useful identification begins with a visible subject. If several animals appear in the frame, make clear which one you mean. Keep the original photo so you can compare the suggested features with the image rather than relying on a cropped thumbnail.

Clues that help separate species

Body shape, fin placement, bands, spots and colour patterns can help distinguish reef fish. Underwater lighting changes apparent colour, so a red or orange feature may look muted in an uncorrected photo. An unusual angle can also hide the features that separate two species.

Where the sighting happened matters. Note the region, habitat and approximate depth if you know them. A sandy bottom, reef wall or seagrass bed can provide useful context, but habitat alone does not prove a match. Ask how the proposed species fits the location and which visible feature supports the suggestion.

Likely species, uncertainty and lookalikes

An AI fish identification can sound certain even when the image is ambiguous. Treat confidence language as guidance about uncertainty, not as a measured accuracy score. No accuracy percentage is promised here. If the animal is partly hidden, distant or blurred, a family-level answer may be more defensible than a species name.

Compare lookalike species deliberately. Ask which markings, fin shapes or regional differences would distinguish them, and whether those features are actually visible in your photo. Verify important records with a regional field guide, a trusted marine-life reference or a knowledgeable local guide.

Take a better identification photo

If conditions and your training allow, photograph the animal from the side and keep the whole body in frame. A second angle can help show fins, markings or head shape. Record the location and depth after the dive while your memory is fresh.

Do not chase, touch, move or corner wildlife to improve a picture. Maintain buoyancy, protect the reef and keep your buddy and gas checks ahead of photography. A missed photograph is preferable to disturbing an animal or losing awareness.

What a photo cannot reliably tell you

A photograph may not reveal sex, age, health, toxicity or the exact species in a group with very similar members. Steve cannot establish that an animal is safe to handle. Identification is not permission to touch marine life.

The tool also cannot replace specialist examination where a scientific, conservation or medical decision depends on the answer. If the result conflicts with the location or visible anatomy, keep the uncertainty in your notes instead of forcing a match.

Follow-up questions worth asking

Try: Which features in my photo support this identification? What other species look similar in this region? Is the depth consistent with that species? What would I need to photograph to distinguish the two candidates?

Use AI Dive Chat for a longer discussion of habitat or behaviour. If you are choosing where to look for marine life on a future trip, the Dive Trip Planner can help organise operator questions. Neither tool guarantees a wildlife sighting.

Frequently asked questions