Fish landings by Irish fishing vessels declined by 15% last year, according to latest figures from the Central Statistics Office.
The figures show that Irish vessels landed 175,000 tonnes of fish at both Irish and foreign ports in 2022, down from 206,000 tonnes the previous year.
Over the last ten years, total fish landings by Irish vessels have been declining from a high of 276,000 tonnes in 2014, a 37% drop.
Reacting to the 2022 decline Sean O'Donaghue, CEO of the Killybegs Fishermens Organisation, said it is no surprise.
"We lost 25% of our mackerel quota overnight in Brexit. Thats around 15,000 or 17,000 tonnes," he said.
"The vessels that fish pelagic species including mackerel were already only fishing for five months of the year, but because of Brexit they now fish four months of the year. It's inevitable that landings would be down," Mr O'Donaghue added.
The CSO figures also show that fish landings by foreign vessels in Irish ports last year amounted to 41% of the total landings in Ireland.
Foreign vessels landed 110,000 tonnes here, down 7,000 tonnes on 2021 and 26,000 tonnes on 2020.
Killybegs in Co Donegal, where the pelagic fishing fleet is based, was the port with by far the biggest fish landings in 2022 at 103,000 tonnes.
Castletownbere in Co Cork was a distant second at 8,500 tonnes followed by Dunmore East in Co Waterford at 5,400 tonnes, Dingle, Co Kerry, at 4,000 tonnes and Kilmore Quay in Co Wexford at 3,600 tonnes.
Some 2,900 tonnes were landed in Howth, Co Dublin as well as 2,400 tonnes in Baltimore, Co Cork, and 1,995 tonnes in Ros a Mhíl in Co Galway.