Inland Fisheries Ireland is seeking submissions on oyster dredging in Co Mayo for 2027–2032, with environmental assessments identifying potential disturbance to protected waterbirds.
Inland Fisheries Ireland (IFI) has opened a public consultation on proposed oyster dredging licences in Blacksod Bay, Co Mayo, covering the period from 2027 to 2032.
The consultation, announced on Wednesday (14 October), concerns the possible licensing of oyster dredging in designated areas of the bay, with submissions invited until 13 November 2026.
IFI says it will decide whether to issue licences, with conditions, or refuse them following the public and statutory consultation process.
Eight-Day Oyster Fishery
A Natura Impact Statement published by IFI provides details of the existing native oyster fishery and the environmental considerations associated with continued dredging.
The assessment, prepared by KD Environmental Ltd and dated 9 October 2026, states that approximately 26 licences were issued for oyster dredging in Blacksod Bay in 2026.
It also states that no new oyster dredging licences will be issued in the bay in 2027.
Dredging is restricted to a maximum of eight days annually during February and March, using a four-foot metal dredge towed from the side or stern of a fishing vessel.
The activity takes place within the Mullet/Blacksod Bay Complex Special Area of Conservation (SAC) and Blacksod Bay/Broadhaven Special Protection Area (SPA), both designated under European environmental legislation.
Environmental Assessment Identifies Bird Disturbance Risk
The Appropriate Assessment screening identified a potential risk of disturbance to red-breasted mergansers while feeding within the protected waters of Blacksod Bay.
This prompted a further Natura Impact Statement examining the possible effects of dredging and measures needed to protect the conservation interests of the area.
The assessment recommends that oyster harvesting should not take place in all three designated dredging areas on the same day.
It states that this restriction must be incorporated into any dredging licences issued, to limit the potential disturbance of feeding birds.
A separate 2026 study by Aquafact examined the effects of native oyster dredging on seabed habitats and marine life. The environmental assessment reports that the study did not identify the approximately 15% threshold for significant continuous or ongoing disturbance as being triggered by the activity in Blacksod Bay.
The environmental issues surrounding dredging in the bay have been raised previously.
In 2025, Coastwatch called for greater protection of seagrass meadows in north Mayo, citing evidence of seabed disturbance at Elly Bay and advocating alternatives to bottom dredging in sensitive marine habitats.
Earlier, in 2015, specific management measures were introduced for scallop fishing in Blacksod Bay to reduce risks to protected habitats. These included restrictions on fishing areas, seasonal controls and GPS monitoring requirements.
Those measures concerned scallop fishing rather than the native oyster fishery now under consultation.
Public Submissions Invited Until November
IFI is inviting observations on the proposed oyster dredging licensing arrangements within 30 days of the notice.
Submissions may be emailed to [email protected] or sent in writing to the Director, Inland Fisheries Ireland, Ardnaree House, Abbey Street, Ballina, Co Mayo, F26 K029.
The closing date is 13 November 2026.
The supporting environmental documentation, including the Natura Impact Statement and Appropriate Assessment screening determination, is available through Inland Fisheries Ireland's publications website.
Documents may also be inspected at IFI's Ballina offices during normal office hours.
No final decision on the proposed licensing arrangements has yet been announced.

















































