2025 Declared the 'Year of the Octopus' Along Britain's Southern Shores.
Unprecedented encounters of one of the world's most intelligent invertebrates during the summer season have resulted in the declaration of 2025 as the year for octopuses in a yearly report of Britain’s seas.
Ideal Conditions Driving a Surge
An unusually warm winter and then an exceptionally warm spring catalyzed a huge population of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was approximately over a dozen times what we would usually anticipate in this region,” commented an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were present in British seas this year – that’s a huge increase from historical averages.”
The common octopus is found in UK waters but usually so scarce it is infrequently encountered. A population bloom is the result of the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant increased juvenile survival, possibly in part fuelled by abundant stocks of spider crabs seen in the area.
An Uncommon Occurrence
The last time, an octopus bloom of this size was observed in 1950, with past documentation indicating the last bloom prior to that was in 1900.
The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Video footage show octopuses gathering in groups – they are usually solitary – and moving along the bottom on their tentacle tips. One creature was even filmed grabbing a diver's camera.
“During a first dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “And these are big. Two kinds exist in these waters. One species is smaller, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”
Future Prospects and Other Surprises
Another mild winter going into 2026 suggests the potential another surge in 2026, because historically, under these conditions, events have occurred consecutively for two years in a row.
“Still, the chances are low, looking at history, that it will persist indefinitely,” they stated. “Marine life is unpredictable at the moment so it’s hard to forecast.”
The assessment also celebrated other “surprises, successes and joyful moments” across British shores, including:
- Unprecedented numbers of grey seals recorded in Cumbria.
- Exceptional populations of the iconic seabirds on an island off Wales.
- A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
- A variable blenny spotted off the coast of Sussex for the first time.
Not All Positive News
The year had its low points, however. “The year was bookended by marine incidents,” noted a conservation leader. “A significant shipping incident in March and the release of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to safeguard and rehabilitate our shorelines.”