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From 220 tonnes to 3,700: the octopus that arrived off Devon and ate the shellfish

Qurexa Editorial Team17 October 20267 min read 0 0
From 220 tonnes to 3,700: the octopus that arrived off Devon and ate the shellfish

What happened

Something unusual is happening in the sea off south-west England. There are suddenly a great many octopus. On 15 October 2026, Defra held a conference in response. Fishermen, fisheries managers and scientists came together, including experts from other countries. Defra published an account of the meeting on 16 October 2026. The numbers are the striking part. Since 2021, octopus landed into UK ports by UK vessels has risen by nearly 1,500%. The annual average was around 220 tonnes. It is now over 3,700 tonnes. Anjali Goswami, Defra's Chief Scientific Advisor, said octopus numbers have "climbed dramatically" off the South West coast in the last year. For some fishermen this is good news. A valuable new fishery opened almost overnight. For others it is the opposite. Shellfish fishermen report that their stocks have been severely depleted, because octopus eat shellfish. Crab and lobster are exactly the sort of thing an octopus hunts. There is a third problem that is nothing to do with biology. More boats are now fishing the same areas, and that is causing tension between crews and raising safety concerns. Mike Cohen, chief executive of the National Federation of Fishermen's Organisations, called the species "a threat and an opportunity" for fishermen, and "a massive challenge" for fisheries management. He described it as fast-growing, short-lived and highly predatory. Isobel Johnston, Head of Sustainable Fisheries at the Marine Management Organisation, said fishermen are central to the developing fishery, and that industry, scientists and regulators need to work together on how it is managed. Scientists at the conference presented evidence on what might be driving the bloom, how the octopus population behaves, what research is needed, and what management options exist. International experts described what happened in Brittany, in France, and how Spain and Australia have handled similar situations. Defra and the Marine Management Organisation will publish a summary of the discussions, which will inform what they do next.

Why this matters

Three words from Mike Cohen explain the whole difficulty: fast-growing, short-lived, highly predatory. Fast-growing and short-lived means an octopus population can appear and disappear quickly. Unlike a cod stock, which builds up over many years, this is a species that can boom in a season. That makes it very hard to manage. By the time you have gathered enough data to set a sensible limit, the situation may already have changed. Highly predatory is why shellfish fishermen are worried. An octopus is an efficient hunter of crab and lobster. If there are suddenly a great many of them, the shellfish they eat decline. Crab and lobster are the backbone of many small inshore fishing businesses in the South West. Those businesses did not choose this change and cannot do much about it. So the same event is a windfall for one group of fishermen and a serious threat to another, often operating from the same harbour. That is an awkward thing for a government to respond to, because there is no single answer that helps everyone. Then there is the safety point, which is easy to overlook. When a new fishery opens and more boats crowd into the same water, gear gets tangled, boats get too close, and the work becomes more dangerous. Fishing is already one of the most dangerous jobs in Britain. The reason to look at Brittany, Spain and Australia is simple: this has happened elsewhere, and other people have already made the mistakes. Learning from them is cheaper than repeating them.

What the evidence actually says

The landings figures are solid, because they are records of fish brought into port and sold. Nearly 1,500% up, from around 220 tonnes to over 3,700 tonnes since 2021, is a measured fact. But landings are not the same as population. More octopus landed could partly reflect more fishermen going after octopus, because they now know it is there and worth catching. Both things are happening at once, and the published account does not separate them. The published account also does not name the species. Mike Cohen describes its characteristics, but there is no species identified in Defra's write-up, so anyone stating the exact species is going beyond what has been released. On why it is happening, Defra says scientists presented evidence on environmental drivers. It does not say what they concluded. Warmer water is the explanation most often suggested for shifts like this, but Defra has not published a cause, and it would be wrong to present one as settled. How long it will last is also unknown. Short-lived species can collapse as quickly as they appear. The Brittany experience is being studied precisely because nobody can yet say whether this is a permanent change or a temporary spike. What has actually been decided? Nothing yet. A conference was held. A summary will be published. That summary will inform future decision-making. There are no new rules, no quotas and no support schemes announced. For fishermen deciding whether to invest in octopus gear, that uncertainty is the real story. The fishery is real and valuable now. The rules governing it, and whether the octopus will still be there in three years, are both unknown.

Practical advice

If you fish commercially in the South West, the Marine Management Organisation is the body to stay close to. Isobel Johnston's point that fishermen are central to the developing fishery is an invitation to be involved, and the summary document from this conference is where the direction of travel will first appear. Be cautious about large investment in gear for a species whose population behaviour is not understood and whose management rules do not exist yet. Short-lived species can vanish. That is not a reason to stay out, but it is a reason to think about how quickly you need to recoup the cost. If you fish for crab or lobster and your catches have fallen, report it rather than absorbing it. Depletion only becomes a policy problem when it is recorded. On safety, if crowding is making a fishing ground dangerous, that is a matter to raise with your producer organisation and the harbour authority before there is an incident, not after. If you buy and eat seafood, this is an opportunity rather than a problem. There is a great deal of British-landed octopus available. Octopus is a sustainable-looking choice at present simply because it is abundant, though that may change. Your fishmonger will know what has been landed locally, and asking is the easiest way to support inshore boats. If you are simply interested, the summary from Defra and the Marine Management Organisation will be published and is worth reading when it appears. It is likely to be the clearest public account of what is actually going on.

What to know

Octopus numbers off south-west England have risen sharply. UK vessels' octopus landings into UK ports are up nearly 1,500% since 2021, from around 220 tonnes a year to over 3,700 tonnes. Defra held a conference about it on 15 October 2026, reported on 16 October, bringing together fishermen, managers and scientists, including international experts from Brittany, Spain and Australia. It is a windfall for some fishermen and a serious problem for others, because octopus prey on crab and lobster. Shellfish fishermen report severely depleted stocks. More boats in the same areas is also causing tension and safety concerns. No cause has been officially confirmed, no species named in the published account, and no new rules or quotas announced. Defra and the Marine Management Organisation will publish a summary to inform future decisions. The species is described as fast-growing, short-lived and highly predatory, which means the population could change quickly in either direction. Sources: GOV.UK (Department for Environment, Food and Rural Affairs), "Octopus explosion off South West prompts talks between fishermen and scientists", 16 October 2026, https://www.gov.uk/government/news/octopus-explosion-off-south-west-prompts-talks-between-fishermen-and-scientists ; GOV.UK, Marine Management Organisation, https://www.gov.uk/government/organisations/marine-management-organisation This article is for general information and is not business, financial or safety advice. If you eat shellfish or seafood and have a food allergy, always check with the seller, and seek medical advice about any reaction.

#fishing#octopus#Defra#marine life#seafood#South West England

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