The Marine Institute has published The Stock Book 2025: Annual Review of Fish Stocks with Management Advice for 2026.
The report assesses 74 key fish stocks important to Ireland and provides evidence-based advice for the year ahead. It is available through the Marine Institute’s Open Access Repository.
The latest edition highlights the impact of changing environmental and oceanographic conditions on commercial fisheries.
Dr Ciaran Kelly, Director of Fisheries and Ecosystem Advisory Services (FEAS), said the findings are significant.
“The 2025 Stock Book provides vital insights into how a changing marine environment is influencing fish stocks around Ireland,” he said. “These scientific assessments form an essential evidence base for informing the medium term outlook for Ireland’s seafood sector.”
Dr Kelly said Marine Institute scientists continue to contribute to the work of the International Council for the Exploration of the Seas (ICES), which provides annual advice on Total Allowable Catches.
The publication represents two years of scientific work, including at-sea surveys, laboratory sampling, catch analysis and forecasting to inform management advice for 2026.
For the first time in 14 years, the number of stocks with biomass above key productivity thresholds has declined, despite no increase in fishing pressure.
A new chapter titled “Fisheries and Ecosystems” examines climate change, oceanographic trends and environmental variability, with a focus on the Celtic Sea.
The report notes rising water temperatures may be disrupting plankton cycles, reducing food availability for juvenile fish. It also points to earlier seasonal peaks in copepod biomass and more frequent marine heatwaves in the Northeast Atlantic.
Species such as cod, haddock and whiting are experiencing persistently low recruitment, meaning fewer young fish are entering the stocks.
Dr Rick Officer, CEO of the Marine Institute, said the publication reflects extensive collaboration.
“The Stock Book represents a huge scientific effort and close partnership with the Irish fishing industry,” he said. “Many fish stocks remain in a reduced state, and continued investment in research and monitoring are critical to informing effective management responses to evolving environmental conditions.”
The Marine Institute said continued scientific monitoring is essential to detect change and provide robust, up-to-date advice for fisheries management.

















































