The European Environmental Bureau is a network of around 140 environmental citizens' organisations based in more than 30 countries. The EEB is a democratic federation, representing local, national, European and international groups in European Union Member States, plus some accession and neighbouring countries. Among their lines of action, EEB includes issues to do with water and pollution.

NOBANIS is a network of common databases on alien and invasive species of the region Northern and Central Europe. By establishing a common portal access to IAS-related data, information and knowledge in the region is facilitated. Includes alien species in marine environments.

EUROWA is a network of European oiled wildlife response experts who are working together to improve professionalism in marine wildlife emergency response. EUROWA have been building their network of wildlife professionals for many years and with the help of EU Civil Protection funding through the EUROWA-1 and EUROWA-2 projects, in order to combat the devastating impact of marine pollution events such as oil spills on marine life and local communities. EUROWA’s aim is to provide a well-disciplined, coordinated, and professional wildlife response team consisting of experts and their equipment, which can quickly be put together and sent to assist a European country that is facing a wildlife emergency.

The focus of award-winning organization Everwave since 2018 has been on preventing plastic from entering the oceans by attending to rivers, moving from their original platform of the oceans to the source of the problem. They use active and passive clean-up technologies to efficiently collect garbage and return it to a sustainable cycle, involving their ‘CollectiX’ garbage collection boats and HiveX river platforms, combined with AI. Cameras and sensors on the boats, on bridges or on drones are used to record images and videos of the plastic waste in the rivers. These are evaluated using AI to understand the composition of the garbage, and identify its sources, in order to take preventative action.

EMR is a national programme of experiential learning about marine conservation, established in eight regions of New Zealand with up to 28 coordinators, with a sister programme in one state of Australia. EMR provide schools and their communities with the expertise and knowledge to experience their local marine environment first-hand. Supported by the Mountains to Sea Conservation Trust.

The primary goal of Exploring by the Seat of Your Pants is to inspire the next generation of scientists and explorers. They do this by bringing those on the frontlines of science, exploration, adventure and conservation, live into classrooms through virtual guest speakers and field trips. Since September 2015, they have hosted 3,500 live events, connecting over a million students to scientists and explorers in 96 countries, ‘… free for classrooms everywhere!’ The secondary purpose of Exploring by the Seat of Your Pants is to fund innovative research, conservation, expeditions, etc. Their partners provide lessons and virtual field trips for classrooms and in exchange receive donations to their organizations to carry out research, conservation and expedition activities.

Fathoms Free is a group comprised of volunteer divers determined to rid the UK's coastal waters of marine debris. They organize campaigns to remove lost or abandoned fishing gear, including Paddle for Plastic, Dive against Debris, and cleanup projects.

Fauna and Flora International aims to change the policy and behaviour that contribute to biodiversity loss by engaging a wide range of governments and non-governmental organizations, and by raising the profile of biodiversity within the wider global development debate. This includes marine biodiversity.

Fearless Fund harnesses our ocean’s tremendous potential to produce energy and sustainable products while pioneering the removal of carbon dioxide (CDR). The Fearless team assists the health of our systems while producing economically viable and sustainable biomass in the ocean. Biomass grown in the ocean saves costly inputs of land-based agriculture. The US DOE ARPA-E funds the Fearless Fund-led team of US National Labs, marine engineers and universities testing an initiative to harvest floating macroalgae for renewable fuel, CO2 removal and the Blue Economy. Fearless Fund pioneers the scale-up of ocean-based plant production as an alternative energy source and an important contribution to a more sustainable economy. The process reduces excess nutrient runoff, therefore benefitting the health of various marine ecosystems.

Filicudi WildLife Conservation focuses on the study and conservation of the marine resources of the Aeolian Archipelago, particularly the populations of cetaceans ( bottlenose dolphins, striped dolphin , sperm whale ) and sea turtles. In addition to their research activities, they run a Sea Turtle First Aid programme, educational programmes, and ecotourism initiatives.

FishAct is a European movement working to end the illegal overfishing of our oceans. The stated mission is to "end the industrial overfishing of the oceans" and to "empower individuals to get actively involved in building grassroots citizen-led conservation communities". Active local chapters in Germany, Sweden, the Netherlands, Spain the United Kingdom and most recently Finland. Campaigns have included gathering support for the release of captive cetaceans, actions against dolphin drive hunts and campaigning to end overfishing of the endangered bluefin tuna in the Mediterranean Sea.

FishBase is a global biodiversity information system on finfishes. Its initial goal to provide key facts on population dynamics for 200 major commercial species has now grown to having a wide range of information on all species currently known in the world: taxonomy, biology, trophic ecology, life history, and uses, as well as historical data reaching back to 250 years. FishBase is currently hosted by the Quantitative Aquatics, Incorporated (Q-quatics), (https://www.q-quatics.org/) a non-stock, non-profit, non-governmental organization engaged in the development and management of global databases on aquatic organisms. Management of the FishBase is in the Philippines, while members of the consortium are based all around the world.