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Greenpeace Plans New Sea Barrier Action in UK Marine Protected Areas

24th June 2026
Ocean Action — Greenpeace UK says it will deploy new underwater boulder barriers in Marine Protected Areas after accusing successive governments of failing to fully protect offshore habitats from destructive industrial fishing practices.
Ocean Action — Greenpeace UK says it will deploy new underwater boulder barriers in Marine Protected Areas after accusing successive governments of failing to fully protect offshore habitats from destructive industrial fishing practices Credit: Kristian Buus

Greenpeace UK has announced plans to deploy new underwater boulder barriers in British Marine Protected Areas (MPAs), reviving a controversial tactic it says helped secure protection for parts of the North Sea and English Channel.

The environmental group says it will take direct action after accusing successive UK governments of failing to use post-Brexit powers to fully protect marine habitats from industrial fishing. The move comes a decade after the Brexit referendum and five years after the Fisheries Act 2020 gave ministers greater powers to regulate fishing activity in UK waters.

Greenpeace previously placed boulders on the seabed at the Dogger Bank MPA in 2020, the Offshore Brighton MPA in 2021 and the South West Deeps MPA off Cornwall in 2022. The organisation says the barriers were designed to prevent bottom trawlers from operating in sensitive marine habitats.

Protection Zone — Greenpeace's vessel Esperanza deploys inert granite boulders in the Offshore Brighton Marine Protected Area in 2021. The underwater barrier was created to help prevent bottom trawling and protect vulnerable seabed habitats in the English Channel. Photo: Suzanne PlunkettProtection Zone — Greenpeace's vessel Esperanza deploys inert granite boulders in the Offshore Brighton Marine Protected Area in 2021. The underwater barrier was created to help prevent bottom trawling and protect vulnerable seabed habitats in the English Channel. Photo: Suzanne Plunkett

Bottom trawling was subsequently banned in Dogger Bank and Offshore Brighton as part of the Marine Management Organisation’s MPA byelaw programme. However, Greenpeace argues that many protected areas remain open to other forms of industrial fishing.

The group says its analysis found that 1.3 million tonnes of fish have been caught in offshore UK MPAs since 2020, with more than one million tonnes taken by pelagic trawlers.

Greenpeace UK co-executive director Will McCallum said governments had failed to use existing powers to protect marine ecosystems. “Post-Brexit powers to fully protect marine protected areas have been available to successive governments for the last five years but all have sat back and let destructive industrial fishing continue,” he said. “Our oceans cannot wait any longer. If this government won’t protect our seas, we will.”

The campaign is backed by several conservation organisations, including Oceana, Blue Marine Foundation, The Angling Trust and Rewilding Britain. Public figures supporting the initiative include Stephen Fry, Paloma Faith, Simon Pegg and environmental campaigner Mya-Rose Craig.

In a letter to Prime Minister Keir Starmer, the signatories called for stronger protection of marine habitats and greater action to support coastal communities and marine wildlife. Singer Paloma Faith said Marine Protected Areas should be “more than a promise on paper”, while actor Simon Pegg described government action on the issue as overdue.

Greenpeace has not yet announced the locations of the proposed new barriers but says it intends to create further protected ocean sanctuaries unless stronger measures are introduced to safeguard existing MPAs.

Published in Marine Planning
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Marine Protected Areas (MPAs) - FAQS

Marine protected areas (MPAs) are geographically defined maritime areas where human activities are managed to protect important natural or cultural resources. In addition to conserving marine species and habitats, MPAs can support maritime economic activity and reduce the effects of climate change and ocean acidification.

MPAs can be found across a range of marine habitats, from the open ocean to coastal areas, intertidal zones, bays and estuaries. Marine protected areas are defined areas where human activities are managed to protect important natural or cultural resources.

The world's first MPA is said to have been the Fort Jefferson National Monument in Florida, North America, which covered 18,850 hectares of sea and 35 hectares of coastal land. This location was designated in 1935, but the main drive for MPAs came much later. The current global movement can be traced to the first World Congress on National Parks in 1962, and initiation in 1976 of a process to deliver exclusive rights to sovereign states over waters up to 200 nautical miles out then began to provide new focus

The Rio ‘Earth Summit’ on climate change in 1992 saw a global MPA area target of 10% by the 2010 deadline. When this was not met, an “Aichi target 11” was set requiring 10% coverage by 2020. There has been repeated efforts since then to tighten up MPA requirements.

Marae Moana is a multiple-use marine protected area created on July 13th 2017 by the government of the Cook islands in the south Pacific, north- east of New Zealand. The area extends across over 1.9 million square kilometres. However, In September 2019, Jacqueline Evans, a prominent marine biologist and Goldman environmental award winner who was openly critical of the government's plans for seabed mining, was replaced as director of the park by the Cook Islands prime minister’s office. The move attracted local media criticism, as Evans was responsible for developing the Marae Moana policy and the Marae Moana Act, She had worked on raising funding for the park, expanding policy and regulations and developing a plan that designates permitted areas for industrial activities.

Criteria for identifying and selecting MPAs depends on the overall objective or direction of the programme identified by the coastal state. For example, if the objective is to safeguard ecological habitats, the criteria will emphasise habitat diversity and the unique nature of the particular area.

Permanence of MPAs can vary internationally. Some are established under legislative action or under a different regulatory mechanism to exist permanently into the future. Others are intended to last only a few months or years.

Yes, Ireland has MPA cover in about 2.13 per cent of our waters. Although much of Ireland’s marine environment is regarded as in “generally good condition”, according to an expert group report for Government published in January 2021, it says that biodiversity loss and ecosystem degradation are of “wide concern due to increasing pressures such as overexploitation, habitat loss, pollution, and climate change”.

The Government has set a target of 30 per cent MPA coverage by 2030, and moves are already being made in that direction. However, environmentalists are dubious, pointing out that a previous target of ten per cent by 2020 was not met.

Conservation and sustainable management of the marine environment has been mandated by a number of international agreements and legal obligations, as an expert group report to government has pointed out. There are specific requirements for area-based protection in the EU Marine Strategy Framework Directive (MSFD), the OSPAR Convention, the UN Convention on Biological Diversity and the UN Sustainable Development Goals. 

Yes, the Marine Strategy Framework directive (2008/56/EC) required member states to put measures in place to achieve or maintain good environmental status in their waters by 2020. Under the directive a coherent and representative network of MPAs had to be created by 2016.

Ireland was about halfway up the EU table in designating protected areas under existing habitats and bird directives in a comparison published by the European Commission in 2009. However, the Fair Seas campaign, an environmental coalition formed in 2022, points out that Ireland is “lagging behind “ even our closest neighbours, such as Scotland which has 37 per cent. The Fair Seas campaign wants at least 10 per cent of Irish waters to be designated as “fully protected” by 2025, and “at least” 30 per cent by 2030.

Nearly a quarter of Britain’s territorial waters are covered by MPAs, set up to protect vital ecosystems and species. However, a conservation NGO, Oceana, said that analysis of fishing vessel tracking data published in The Guardian in October 2020 found that more than 97% of British MPAs created to safeguard ocean habitats, are being dredged and bottom trawled. 

There’s the rub. Currently, there is no definition of an MPA in Irish law, and environment protections under the Wildlife Acts only apply to the foreshore.

Current protection in marine areas beyond 12 nautical miles is limited to measures taken under the EU Birds and Habitats Directives or the OSPAR Convention. This means that habitats and species that are not listed in the EU Directives, but which may be locally, nationally or internationally important, cannot currently be afforded the necessary protection

Yes. In late March 2022, Minister for Housing Darragh O’Brien said that the Government had begun developing “stand-alone legislation” to enable identification, designation and management of MPAs to meet Ireland’s national and international commitments.

Yes. Environmental groups are not happy, as they have pointed out that legislation on marine planning took precedence over legislation on MPAs, due to the push to develop offshore renewable energy.

No, but some activities may be banned or restricted. Extraction is the main activity affected as in oil and gas activities; mining; dumping; and bottom trawling

The Government’s expert group report noted that MPA designations are likely to have the greatest influence on the “capture fisheries, marine tourism and aquaculture sectors”. It said research suggests that the net impacts on fisheries could ultimately be either positive or negative and will depend on the type of fishery involved and a wide array of other factors.

The same report noted that marine tourism and recreation sector can substantially benefit from MPA designation. However, it said that the “magnitude of the benefits” will depend to a large extent on the location of the MPA sites within the network and the management measures put in place.

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