2025 Proclaimed 'The Octopus Year' Off England's Southern Shores.
Unprecedented observations of a supremely intelligent sea creature during the summer season have prompted the designation of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.
A Confluence of Factors Driving a Surge
A mild winter and then a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to settle 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 normally expect in Cornish waters,” stated an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were present in British seas this year – representing a massive jump from what is typical.”
*Octopus vulgaris* is found in British seas but usually so scarce it is infrequently encountered. A sudden increase is caused by a combination of gentle winter conditions and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, maybe aided by significant populations of other marine life seen in the area.
A Historic Event
The last time, such an octopus proliferation of this size was recorded in the mid-20th century, with historical records indicating the last bloom prior to that happened in 1900.
The huge numbers of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the ocean floor on the tips of their limbs. One individual was even recorded reaching for a diver's camera.
“During a first dive off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “And these are big. Two kinds exist in UK waters. The curled octopus is smaller, about the size of a football, but these common octopuses can be reaching impressive sizes.”
Future Prospects and Other Surprises
If conditions remain mild this coming winter could lead to a second bloom in 2026, because historically, with such patterns, populations have surged again for two years in a row.
“However, it is unlikely, looking at history, that it will go on for a long time,” they said. “Marine life is unpredictable these days so it’s hard to forecast.”
The assessment also highlighted other “surprises, successes and joyful moments” around the UK coastline, including:
- Highest-ever counts of gray seals recorded in one northern region.
- Exceptional populations of the iconic seabirds on Skomer.
- A first-ever sighting of an unusual mollusc in a northern county, normally residing farther south.
- A Mediterranean fish species discovered off the coast of a southern county for the first time.
A Note of Caution
Not everything was good news, however. “The calendar year was marked by marine incidents,” stated an expert. “A major tanker collision in March and a spill of plastic pollution off the southern coast served as stark reminders. Dedicated individuals are working tirelessly to protect and restore our marine habitats.”