2025 Proclaimed the 'Year of the Octopus' Off England's Southern Shores.
Unprecedented sightings of a supremely intelligent sea creature during the summer season have resulted in the declaration of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.
A Confluence of Factors Driving a Surge
A gentle winter and then a remarkably hot spring catalyzed unprecedented numbers of Mediterranean octopuses to settle along England’s south coast, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was roughly over a dozen times what we would typically see in this region,” stated a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were found in UK waters this year – that’s a huge increase from what is typical.”
The common octopus is native to British seas but ordinarily in such small numbers it is infrequently encountered. A sudden increase is the result of the dual effect of a mild winter and a warm breeding season. These ideal conditions meant increased juvenile survival, possibly in part fuelled by significant populations of spider crabs also recorded.
A Rare Phenomenon
Previously, such an octopus proliferation of this size was documented in 1950, with archival data indicating the one before that happened in 1900.
The sheer quantity of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Video footage show octopuses gathering in groups – they are usually solitary – and ambulating along the bottom on their arm ends. A curious octopus was even recorded reaching for a diver's camera.
“The first time I dived off the Lizard peninsula this year I saw multiple octopuses,” they noted. “And these are big. We have two species in the region. One species is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”
Looking Ahead & Coastal Highlights
Another mild winter going into 2026 could lead to a second bloom the following year, because based on records, with such patterns, events have occurred consecutively for two years in a row.
“However, it is unlikely, looking at history, that it will become a permanent fixture,” they said. “The ocean is full of surprises currently so it’s quite an unpredictable situation.”
The assessment also highlighted additional positive marine news across British shores, including:
- Highest-ever counts of grey seals seen in Cumbria.
- Exceptional populations of puffins on an island off Wales.
- The initial discovery of an unusual mollusc in a northern county, typically a southwestern species.
- A type of blenny discovered 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,” stated an expert. “A significant shipping incident in the North Sea and the release of plastic pollution off the Sussex coast served as stark reminders. Dedicated individuals are working tirelessly to safeguard and rehabilitate our shorelines.”
