2025 Proclaimed The Year for Octopuses Along Britain's South Coast.

Exceptionally high sightings of a remarkably clever cephalopod this past summer have led to the declaration of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Perfect Storm for a Population Boom

A mild winter coupled with a very warm springtime triggered unprecedented numbers of Mediterranean octopuses to settle along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly thirteen times what we would typically see in Cornish waters,” stated a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were caught in British seas this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is native to UK waters but typically so rare it is infrequently encountered. A population bloom is the result of a combination of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, maybe aided by significant populations of other marine life also recorded.

A Historic Event

The most recent occasion, such an octopus proliferation of this size was observed in the 1950s, with archival data indicating the one before that was in 1900.

The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Video footage show octopuses being sociable – unlike their typical solitary behavior – and moving along the ocean floor on their tentacle tips. One individual was even filmed grabbing submarine recording equipment.

“On my initial dive in that area this year I saw five octopuses,” the officer added. “And these are big. We have two species in these waters. The curled octopus is quite small, the size of a ball, but these newcomers can be reaching impressive sizes.”

Future Prospects and Other Surprises

A second gentle winter going into 2026 could lead to a second bloom next year, because in the past, under these conditions, the blooms have repeated for two years in a row.

“But, it's improbable, from previous blooms, that it will go on for a long time,” they said. “The ocean is full of surprises currently so it’s quite an unpredictable situation.”

The annual review also celebrated other “surprises, successes and joyful moments” across British shores, including:

• A record number of grey seals seen in Cumbria.
• Record numbers of the iconic seabirds on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
• A type of blenny found off the coast of a southern county for the first occasion.

Environmental Concerns

Challenges were also present, however. “The calendar year was marked by marine incidents,” stated an expert. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Dedicated individuals are working tirelessly to defend and heal our marine habitats.”