Octopus boom brings British fishermen new income and shellfish losses

London, United Kingdom. Unusually warm seas have driven a sharp increase in octopuses around Britain, giving fishermen a valuable new catch while threatening traditional shellfish fisheries. Scientists say the bloom off southwest Britain is the biggest recorded there for at least 75 years.

Exports rise as shellfish fisheries suffer

Industry body Seafish reported that British octopus exports were worth £12.8 million ($17 million) last year, compared with £164,000 the previous year. Buyers from France and Spain accounted for much of the demand.

Some fishermen say the new catch has become a valuable source of income almost overnight. Others report damage to the shellfish populations supporting long-established fisheries.

Researchers found that over half of UK fishermen had reported harm from octopuses feeding on crab, lobster and scallop stocks. Some fisheries recorded catch declines of between 30 per cent and 50 per cent, while losses across affected fisheries surpassed £10 million in 2025.

Government considers management of emerging fishery

Fishermen joined regulators and scientists this week for a conference hosted by the government, following a nearly 1,500 per cent increase in British octopus landings since 2021. Landings exceeded 3,700 metric tons, against a yearly average of roughly 220 tons.

The government said on Friday that the discussions would inform future management decisions for the emerging fishery. Spain and Australia have encountered similar challenges in recent years.

Rapid ecological change creates challenges

Mike Cohen, CEO of the National Federation of Fishermen’s Organisations, said the abrupt appearance of a rapidly growing, short-lived and highly predatory species challenged established understanding and expectations of British coastal ecosystems.

“They are both a threat and an opportunity for fishermen, and a massive challenge for fisheries management.”

Anjali Goswami, chief scientific adviser in the government’s environment department, said the increase in octopuses highlighted how rapidly the marine ecosystem could change.