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MARA Study Raised Concerns About Impact of Surveys At Sea On Marine Life

27th May 2026
Silver Shoal: A dense shoal of Atlantic herring moves through Irish waters, as a new MARA study highlights concerns over the impact of offshore survey noise on spawning fish and sensitive marine ecosystems.
Silver Shoal: A dense shoal of Atlantic herring moves through Irish waters, as a new MARA study highlights concerns over the impact of offshore survey noise on spawning fish and sensitive marine ecosystems Credit: TCD

A new study for Ireland’s marine regulator says that repeated geophysical and geotechnical surveys, which are also clustered and overlap with sensitive habitats, could negatively impact marine life.

As Afloat has reported, the Maritime Area Regulatory Authority (MARA) published a study this month examining the impacts of geophysical and geotechnical surveys on fish and shellfish in Irish waters. The afloat article cound be found here.

The study, entitled “Review of Impacts of Geophysical and Geotechnical Surveys on Marine Fish and Shellfish in Irish Waters”, highlights knowledge gaps regarding the impacts of underwater noise on marine life. It also says there is a “clear lack of empirical studies on the impacts of geotechnical surveys on fish, shellfish and crustaceans, meaning impact assessments often rely on extrapolation from other seabed-disturbing activities”.

“Short-term sub-lethal responses in fish, such as stress or temporary displacement, are particularly poorly quantified and require further investigation,” the report prepared by Aquafact (part of the APEM group) on behalf of MARA says.

While impulsive noise from seismic surveys and air guns is most consistently linked to short-term behavioural effects such as startle, avoidance, displacement and reduced foraging, more severe effects are mainly reported for eggs, larvae and shellfish, it says.

The report says that continuous noise is “more consistently linked to sublethal effects such as physiological stress, higher metabolic cost, altered behaviour and, in some cases, reduced reproductive success”.

“Habitat loss or removal from geotechnical surveys is expected to be highly localised, but effects may be more important and longer lasting in complex, low-resilience habitats such as reefs, coarse gravels and mixed substrates,” it says. “Suspended sediments and smothering are likely to pose the greatest risk to eggs, larvae, filter feeders and shellfish habitats, especially in low-energy environments,” the report says.

It says that cumulative impacts on marine life are “most relevant where surveys are repeated, clustered or overlap sensitive habitats or life stages, as repeat disturbances can compile and limit recovery”.

The report makes a number of recommendations, including introducing temporal restrictions on surveying to avoid spawning periods of key commercial species, such as Atlantic herring and Atlantic cod, or transition periods of diadromous fish (250 species, including salmon, trout, lamprey, and eel) between freshwater and saltwater.

Other recommendations relate to limiting noise and the risk of smothering habitats with sediment, and advise minimising survey repetition by maximising data sharing both internally and externally, as well as data re-use.

It says survey works should be “staggered to reduce cumulative disturbance to sensitive ecological receptors”, and says that implementation will “be best achieved through liaison with relevant public authorities and stakeholders”.

MARA says the report comes at a time of increasing offshore marine activity within MARA’s regulatory remit, including offshore renewable energy development, subsea infrastructure projects, and marine site investigations.

MARA chief executive Laura Brien said the report will “support informed decision-making across the marine sector”.

“As activity in Irish offshore waters continues to grow, it is essential that decision-making continues to be underpinned by robust scientific understanding and effective environmental stewardship,” she said. “The publication of the report reflects MARA’s ongoing commitment to regulate effectively and impartially, while supporting sustainable marine development,” she said.

Lorna Siggins

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Lorna Siggins

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Lorna Siggins is a print and radio reporter, and a former Irish Times western correspondent. She is the author of Search and Rescue: True stories of Irish Air-Sea Rescues and the Loss of R116 (2022); Everest Callling (1994) on the first Irish Everest expedition; Mayday! Mayday! (2004); and Once Upon a Time in the West: the Corrib gas controversy (2010). She is also co-producer with Sarah Blake of the Doc on One "Miracle in Galway Bay" which recently won a Celtic Media Award

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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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