2025 Proclaimed 'The Octopus Year' Off Britain's South Coast.
Record-breaking sightings of a supremely intelligent sea creature over the summer months have resulted in the declaration of 2025 as the octopus's year in an annual review of UK coastal waters.
A Perfect Storm Driving a Surge
A mild winter and then a remarkably hot spring catalyzed a massive influx of Mediterranean octopuses to take up residence along England’s south coast, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was of the order of about over a dozen times what we would usually anticipate in this region,” explained an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were present in British seas this year – that’s a huge increase from the norm.”
*Octopus vulgaris* is native to UK waters but ordinarily in such small numbers it is seldom observed. An explosive growth is the result of the dual effect of a mild winter and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by large numbers of spider crabs also recorded.
An Uncommon Occurrence
The last time, a population surge of this scale of this size was documented in the 1950s, with historical records indicating the previous major event occurred in 1900.
The huge numbers of octopuses meant they could be easily spotted in shallow waters for the first time in recent history. Video footage show octopuses congregating together – unlike their typical solitary behavior – and ambulating along the ocean floor on their arm ends. One creature was even recorded reaching for submarine recording equipment.
“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “They are large specimens. We have two species in the region. One species is smaller, football-sized, but the *Octopus vulgaris* can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
Another mild winter going into 2026 could lead to a second bloom in 2026, because based on records, with such patterns, populations have surged again for two consecutive years.
“However, it is unlikely, looking at history, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises currently so it’s hard to forecast.”
The report also celebrated other “surprises, successes and joyful moments” across British shores, including:
- A record number of gray seals seen in Cumbria.
- Record numbers of the iconic seabirds on a Welsh island.
- The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species.
- A Mediterranean fish species spotted off the coast of Sussex for the first occasion.
A Note of Caution
Not everything was good news, however. “The calendar year was marked by ecological challenges,” noted a conservation leader. “A significant shipping incident in March and a spill of industrial pellets off the southern coast highlighted ongoing threats. Staff and volunteers are making huge efforts to defend and heal our marine habitats.”
