Our activities
The ALIEN networks
Non-indigenous species are one of the five causes of biodiversity loss. Regional networks monitor them with sea and river users: once validated, your BioObs observations are shared with them.
The networks and their species
Each network follows a list of species to report in its area. Choose yours to discover these species and receive their leaflet.
ALIEN-CorsicaThe ALIEN Corsica network asks divers and sea users to look for and report marine non-indigenous species, to follow how they settle around the island.45 species monitored
ALIEN-OccitaniaDivers, anglers, boaters and shore users report marine non-indigenous species along the Occitanie coast, coordinated by the CPIE Bassin de Thau.48 species monitored
ALIEN-Mer NormandieParticipatory monitoring of non-indigenous and range-expanding species in Normandy’s waters and on its foreshores, coordinated by URCPIE de Normandie.23 species monitored
ALIEN Bay of BiscayThe main marine non-indigenous species that divers and shore naturalists can observe in the Bay of Biscay, in a list put together by Les Amis de BioObs.90 species monitored
ALIEN Celtic SeasThe main marine non-indigenous species that divers and shore naturalists can observe in the Celtic Seas, in a list put together by Les Amis de BioObs.75 species monitored
ALIEN PACALaunched in 2025 by Les Amis de BioObs, ALIEN PACA runs a participatory watch on marine non-indigenous species in Provence-Alpes-Côte d’Azur and Monaco.39 species monitored
ALIEN FreshwaterThe national ALIEN Freshwater network invites divers and naturalists to report non-indigenous species in the rivers, lakes and ponds of mainland France.46 species monitored
How do I take part?
I observe
While scuba diving, snorkelling, freediving or on foot along the shore and the strandline.
I take a photo
A photo, even an imperfect one, lets the validator confirm the identification.
I record my survey
In my BioObs logbook: species, habitat, date and place.
The data travels on
Once validated, it feeds the ALIEN networks and the national programmes monitoring non-indigenous species.
Create my survey
A question about an identification? Write to us.