Warm seas drive record octopus surge in British waters, lifting exports and hurting shellfish

Mixed · 2Octopus landings at British ports have risen by nearly 1,500 per cent since 2021, from a yearly average of about 220 tonnes to more than 3,700 tonnes. 1 2 Centre · 1Reports link the surge to unusually warm seas. Researchers say warm water, together with currents and winds that may have carried larvae north from France and the Channel Islands, are among the most likely causes. 1 Centre · 1Scientists describe the current bloom as the largest seen off southwest Britain in at least 75 years. Research published this year found that every major bloom in the region over the past 125 years coincided with unusually warm seas, and common octopus have been breeding widely in British waters during this event. 1

Right · 1GB News describes such blooms as happening only a handful of times each century, with this the first since the late 1940s. 2 Centre · 1The boom has created a new export market. According to industry body Seafish, the value of British octopus exports rose to £12.8 million ($17 million) last year from £164,000 a year earlier, driven largely by buyers in France and Spain. 1 Centre · 1Octopus also prey on shellfish. Researchers found that more than half of UK fishermen reported negative effects on crab, lobster and scallop stocks, with catches in some fisheries down 30 to 50 per cent and losses to affected fisheries above £10 million in 2025. 1

Right · 1GB News adds that whelks, clams and mussels are also natural prey. It reports delegates warning that shellfish stocks had been "decimated by octopus consumption", with octopus particularly good at getting into crab breeding pots. 2 Mixed · 2The Department for Environment, Food and Rural Affairs (Defra) hosted a conference of fishermen, regulators and scientists on Thursday 15 October. GB News says the fishing industry proposed it and Defra assembled the expertise; it also calls the event an "emergency conference", a term CNA does not use. 2 1 Mixed · 2The government said the conference would help inform future decisions on managing the emerging fishery, a challenge Spain and Australia have also faced. GB News reports that experts from those two countries and from Brittany, where a similar bloom has disrupted fishing communities, shared lessons, and that Defra and the Marine Management Organisation (MMO) have committed to publishing a full summary. 1 2

Mixed · 2Mike Cohen, chief executive of the National Federation of Fishermen's Organisations, said the arrival of the "fast-growing, short lived and highly predatory species" upends established expectations about coastal ecosystems. He called octopus "both a threat and an opportunity for fishermen, and a massive challenge for fisheries management". 1 2 Mixed · 2Anjali Goswami, Defra's chief scientific adviser, called the rise "a stark reminder of how quickly our marine ecosystem can change". Isobel Johnston, the MMO's head of sustainable fisheries, said fishermen must remain "at the heart of this developing fishery". 1 2 Right · 1GB News also reports that, as more vessels crowd the same grounds to catch octopus, tensions between crews have grown and raised safety concerns. 2