2025 Declared The Year for Octopuses Off England's South Coast.
Unprecedented encounters of one of the world's most intelligent invertebrates this past summer have resulted in the declaration of 2025 as the octopus's year in a yearly report of Britain’s seas.
Ideal Conditions Driving a Surge
A mild winter followed by an exceptionally warm spring prompted a massive influx of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was approximately 13 times what we would typically see in Cornish waters,” stated an ocean conservation expert. “Based on the totals, nearly a quarter of a million octopuses were present in these waters this year – that’s a huge increase from the norm.”
*Octopus vulgaris* is found in British seas but typically so rare it is seldom observed. A sudden increase is the result of a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by significant populations of other marine life noted in recent years.
An Uncommon Occurrence
Previously, an octopus bloom comparable was recorded in 1950, with archival data indicating the one before that occurred in 1900.
The huge numbers of octopuses meant they could be easily spotted in nearshore environments for the first time in living memory. Diver videos show octopuses congregating together – contrary to their normally lone nature – and ambulating along the ocean floor on their tentacle tips. One individual was even seen investigating submarine recording equipment.
“During a first dive there this year I saw five of these creatures,” the specialist continued. “They are sizeable. We have two species in the region. One species is quite small, football-sized, but the *Octopus vulgaris* can be up to a metre and a half wide.”
Future Prospects and Other Surprises
Another mild winter this coming winter could lead to a repeat event the following year, because historically, under these conditions, the blooms have repeated for two years running.
“But, it's improbable, from previous blooms, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises at the moment so it’s hard to forecast.”
The annual review also highlighted other “surprises, successes and joyful moments” along the coast, including:
- Highest-ever counts of gray seals recorded in one northern region.
- Record numbers of the iconic seabirds on Skomer.
- The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
- A type of blenny spotted off the coast of Sussex for the first time.
A Note of Caution
Challenges were also present, however. “The period was framed by ecological challenges,” noted a conservation leader. “A significant shipping incident in the North Sea and the release of plastic pollution off the southern coast served as stark reminders. Conservation teams are making huge efforts to protect and restore our coasts.”