Fish populations in the Irish and Celtic Seas are facing a significant decline, prompting calls from marine scientists for urgent action to prevent further collapse. Cod, plaice, and other key species have experienced dramatic drops in numbers over the past decade, raising concerns about the future sustainability of these fisheries and the communities that rely on them.

A letter signed by a group of experts—including Professor Sir John Beddington, who served as the UK government’s chief scientific adviser from 2008 to 2013, marine academics from UK universities, and international researchers—highlights that recent catch limits set by the UK and the European Union have often exceeded scientific recommendations by as much as 58 percent in 2026. High levels of discarding, whereby unwanted fish are thrown back into the sea, have also contributed to declining stocks.

Data cited in the letter shows that since 2016, cod stocks in the Irish Sea have fallen by approximately 80 percent, while Celtic Sea cod stocks have plummeted by 98 percent. Similar drastic declines are reported for plaice, which decreased by 88 percent in the Irish Sea. The scientists warn that six fish stocks in these waters are now so depleted that a zero-catch policy is advised to allow populations to recover.

The experts emphasize that this situation represents both an environmental and economic crisis. They point to international examples where reduced fishing pressure and the establishment of closed areas, such as Marine Protected Areas, have enabled the recovery of fish stocks and the ecosystems that support them. They urge the UK and EU to implement immediate measures, including zero-catch limits and effective protections for key habitats, to facilitate recovery.

Currently, about 90 percent of cod consumed in the UK is imported, primarily from healthier stocks in the North Atlantic and Barents Sea regions. The Marine Conservation Society has previously warned that cod populations in UK waters are at dangerously low levels and that there is no comprehensive plan in place to restore them.

In response, the UK Department for Environment, Food & Rural Affairs (DEFRA) stated its commitment to restoring fish stocks to sustainable levels. The department noted that new measures to protect cod numbers are being introduced this year, aiming to secure the long-term viability of the UK fishing industry.

The debate continues as stakeholders weigh the environmental urgency against economic impacts on fishing communities. However, the scientific consensus underscores the pressing need for more stringent catch limits and enhanced marine conservation efforts to prevent further depletion in the Irish and Celtic Seas.