2025 Declared The Year for Octopuses Along Britain's Southern Shores.

Exceptionally high observations of a supremely intelligent sea creature over the summer months have led to the declaration of 2025 as “the year of the octopus” in a seasonal assessment of Britain’s seas.

A Confluence of Factors for a Population Boom

A mild winter followed by an exceptionally warm spring triggered a huge population of Mediterranean octopuses to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The scale of the catch was roughly thirteen times what we would usually anticipate in this region,” stated a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were caught in UK waters this year – which is a significant rise from what is typical.”

The common octopus is indigenous to these waters but typically so rare it is infrequently encountered. A population bloom is attributed to the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, potentially supported by abundant stocks of other marine life also recorded.

A Historic Event

The most recent occasion, such an octopus proliferation this significant was observed in the mid-20th century, with historical records indicating the last bloom prior to that was in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in shallow waters for the first time in living memory. Underwater recordings show octopuses congregating together – they are usually solitary – and moving along the ocean floor on their arm ends. A curious octopus was even filmed grabbing an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” they noted. “And these are big. We have two species in these waters. The curled octopus is smaller, football-sized, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

A second gentle winter going into 2026 meant it was possible a second bloom in 2026, because historically, in similar situations, events have occurred consecutively for two years running.

“However, it is unlikely, based on past events, that it will become a permanent fixture,” they cautioned. “Marine life is unpredictable at the moment so it’s hard to forecast.”

The annual review also highlighted additional positive marine news around the UK coastline, including:

• Unprecedented numbers of gray seals recorded in Cumbria.
• Record numbers of the iconic seabirds on Skomer.
• The initial discovery of an unusual mollusc in a northern county, usually found in the south-west.
• A variable blenny spotted off the coast of Sussex for the first time.

A Note of Caution

Challenges were also present, however. “The calendar year was marked by environmental disasters,” noted a conservation leader. “A significant shipping incident in March and an accidental discharge of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Conservation teams are making huge efforts to defend and heal our coasts.”