One closed-loop lab. Two verticals.
ReefTox is a closed-loop coral ecotoxicology laboratory in Brittany, France, operating as EcoSeaStems SAS. We cultivate our own coral mother colonies and run acute (96h) ecotoxicity tests across up to 50 coral species and 30 genera, with an optional 3-month chronic study, for two B2B audiences out of one integrated facility.
Arzal, Brittany
Mission
Make predictive and impact-measurement tools available to the scientific community and to companies, to build environments conducive to coral life.
Cosmetics & SPF
Give cosmetics brands and SPF ingredient suppliers the defensible, publishable coral ecotox data they need, ahead of the rules already reshaping the category: Hawaii Act 104, US Virgin Islands Act 8185, and Palau RPPL 10-30. Every paid test includes a free predictive pre-evaluation that scores a formulation's likely coral impact before any coral is exposed.
Marine & Industrial
Give maritime and industrial firms the coral endpoint their existing ecotox programs cannot currently source, before the regulatory cycle they already report under formally requires it.
Team
Marine biology meets cosmetic formulation, in one lab.
Vincent Bourgeteau
President
Biologist. Founded the closed-loop methodology.
Guillaume Bakouch
Director of Business Development
Leads commercial work across both verticals.
Tatiana Thomas
R&D Engineer
Owns protocol execution and test reporting.
Mathilde Bossuyt
Oceanographer, Laboratory Assistant
Coral husbandry and live-test operations.
Founding story
Built for coral, from the mother colony up.
ReefTox exists because coral ecotoxicity testing was an afterthought. General environmental labs could run a standard aquatic toxicity test on a model species. ReefTox was built for what a model species cannot show: coral response across the taxonomic diversity, and the three ocean regions, that real reef ecosystems contain, measured on corals we cultivate ourselves rather than sample from the wild.
ReefTox, operating as EcoSeaStems SAS, built a closed-loop laboratory in Brittany: coral mother colonies, in-house cutting production, testing, and assessment all under one roof. The company combines marine-biology expertise with cosmetic-formulation expertise, the bridge the market was missing.
The cosmetics / SPF vertical anchors the revenue line. In April 2026 at inCos26, ReefTox extended the methodology beyond cosmetics into marine and industrial use cases, coral added as a complementary species to the marine ecotox suites already run for antifouling, ballast water, scrubber wash water, drilling fluids, and cruise operators.
Inside the facility
Inside the closed-loop lab, Arzal, Brittany.
Where we work
Legal entity
EcoSeaStems SAS
ReefTox is the brand name. EcoSeaStems SAS is the legal entity.
Address
18 Parc Acti de l'Estuaire
56190 Arzal, Brittany, France
Timezone: Europe/Paris · Languages: English, French
FAQ
Frequently asked questions.
What is ReefTox?
ReefTox is a closed-loop coral ecotoxicology laboratory in Brittany, France, operating as EcoSeaStems SAS. We cultivate our own coral mother colonies and run acute (96h) ecotoxicity tests across up to 50 coral species and 30 genera, with an optional 3-month chronic study. Two B2B verticals: cosmetics and SPF (anchor revenue line) and marine and industrial (launched April 2026).
Where is ReefTox located?
At 18 Parc Acti de l'Estuaire, 56190 Arzal, Brittany, France.
Who is on the ReefTox team?
Vincent Bourgeteau (President, biologist), Guillaume Bakouch (Director of Business Development), Tatiana Thomas (R&D Engineer), and Mathilde Bossuyt (Oceanographer, Laboratory Assistant).
What makes ReefTox different from a general environmental testing lab?
Coral ecotoxicology is all we do. We cultivate our own corals in a closed-loop facility, no wild sampling, no external dependency. We test across up to 50 coral species and 30 genera.
Which side of the lab do you need?
