This is a preliminary home page. A full website will be available by June 2024.
In the meantime, a concept note is available.
Enquiries are welcome at oosc@one-ocean-science-2025.org



One Ocean Science Congress

4-6 June 2025, Nice (France)

There is One Ocean

There is One Ocean, a global common and a critical resource to human prosperity and well-being. It plays a crucial role in regulating the climate and supporting the livelihoods of three billion people, the vast majority in developing countries.

Climate change, overfishing, pollution, and conflict use

The Ocean is under threat from combined pressures such as climate change, overfishing, pollution, and conflicting uses. It is also a source of solutions, for example to mitigate and adapt to climate change.The Ocean urgently needs decisive, swift, and unified efforts to address its critical condition and maximize the solutions it offers. This presents a major challenge for the global community at the Third United Nations Conference on the Oceans (UNOC3), to be held in Nice from 9 to 13 June 2025. The goal is to spur action and implement SDG 14, which is the least funded of all Sustainable Development Goals.

A UNOC3 Special Event dedicated to Science

CNRS and Ifremer have been tasked with organizing the One Ocean Science Congress (OOSC), a UNOC3 Special Event dedicated to Science, and to provide Heads of State, Government, and the broader society, with comprehensive scientific insights on the Ocean's health and future trajectory. Science-informed decisions should enable the conservation and sustainable use of the Ocean, optimize the solutions it offers, and safeguard the services and benefits it provides to humanity.

About the OOS Congress

The Congress will feature a mix of plenary sessions, including opening and keynote speeches, alongside parallel oral and poster presentations. To enhance interactions between science and society, action and policy, and to engage civil society more broadly, 'townhalls' such as panels and roundtables will also be arranged.

The scientific themes will be solution-oriented, transcending narrow disciplinary boundaries. A key focus will be ensuring alignment between the themes of the Congress and the Ocean Action Panels of UNOC3.
Submissions for oral and poster presentations will be invited under the following provisional themes:

Responsibility and respect

Integrating knowledge systems with a focus on responsibility and respect for the ocean


Transparency in the fisheries sector, including illegal, unreported and unregulated fishing

Food systems

Sustainability, equitability, and safety of ocean-based food systems


Knowledge of the deep ocean and ways to enable its sustainable use

Protection and restoration

Protection and restoration of marine and coastal ecosystems to ensure sustainable and equitable management

Marine genetic resources

Marine genetic resources: from discovery to equitable access and sharing of associated benefits


Measures to assess and end plastic and other types of pollution


Environmental footprint of maritime transport and decarbonation of shipping

Climate mitigation and adaptation

Effectiveness, equitability and safety of ocean-based approaches to reach the mitigation and adaptation goals of the Paris Agreement

Strong science for ocean action

Vibrant science to inform and support ocean action