Through the lens, beneath the sea

Sea slugs: information, photos and a Mediterranean research project

A home for sea slug enthusiasts: an international collection of photos and videos, and a community documenting the sea slugs of the Israeli Mediterranean. Photographed a sea slug? Add an observation.

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What are sea slugs?

Sea slugs are marine gastropods (snails) that have no external shell, or only a very reduced one. Many are small, colorful and strikingly patterned. The best-known group is the nudibranchs, but "sea slugs" also covers other groups, such as sea hares.

On this site you can browse species by order, family and genus, watch videos and view photographs, and find where each species was observed.

The project: sea slugs in the Israeli Mediterranean

The eastern Mediterranean is warming and becoming more tropical. Species that entered from the Red Sea through the Suez Canal (Lessepsian migration) are establishing themselves along the Israeli coast, and the mix of species is changing. Sea slugs are a good group for following this change, and observations by divers and photographers are how it is tracked.

Migrant species

How do you contribute an observation?

Photograph. Take a photo or video of a sea slug while diving or snorkeling. You do not have to be sure of the identification.
Note. Write down where, when and at what depth you saw it.
Upload. Sign up (it is open to everyone) and upload the observation. We will help with the identification.

Add an observation