2025 Declared the 'Year of the Octopus' Along England's South Coast.

Unprecedented encounters of a supremely intelligent sea creature this past summer have led to the designation of 2025 as the octopus's year in a yearly report of UK coastal waters.

A Perfect Storm Driving a Surge

An unusually warm winter coupled with a very warm springtime triggered unprecedented numbers of Mediterranean octopuses to settle along the shores from Cornwall to Devon, across the southwestern peninsula.

“The scale of the catch was roughly over a dozen times what we would usually anticipate in Cornish waters,” explained a marine life specialist. “Calculating the figures, nearly a quarter of a million octopuses were caught in UK waters this year – that’s a huge increase from historical averages.”

The Mediterranean octopus is indigenous to these waters but typically so rare it is infrequently encountered. A sudden increase is caused by the dual effect of gentle winter conditions and a warm breeding season. Such favorable circumstances meant increased juvenile survival, possibly in part fuelled by significant populations of other marine life also recorded.

A Historic Event

Previously, an octopus bloom this significant was recorded in 1950, with archival data indicating the previous major event happened in 1900.

The huge numbers of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the seabed on their arm ends. One individual was even filmed grabbing submarine recording equipment.

“On my initial dive there this year I saw five octopuses,” they noted. “And these are big. We have two species in UK waters. The curled octopus is smaller, football-sized, but these newcomers can be reaching impressive sizes.”

Future Prospects and Other Surprises

A second gentle winter going into 2026 suggests the potential a second bloom next year, because historically, in similar situations, populations have surged again for two years in a row.

“However, it is unlikely, based on past events, that it will become a permanent fixture,” they stated. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”

The assessment also noted additional positive marine news across British shores, including:

• Unprecedented numbers of grey seals seen in Cumbria.
• Peak numbers of the iconic seabirds on an island off Wales.
• The first recording of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
• A Mediterranean fish species discovered off the coast of a southern county for the inaugural time.

A Note of Caution

Challenges were also present, however. “The year was bookended by environmental disasters,” noted a conservation leader. “A significant shipping incident in the North Sea and the release of tonnes of plastic biobeads off the southern coast served as stark reminders. Dedicated individuals are putting in immense work to protect and restore our coasts.”