2025 Declared 'The Octopus Year' Off England's Southern Shores.
Exceptionally high sightings of one of the world's most intelligent invertebrates this past summer have prompted the declaration of 2025 as the year for octopuses in an annual review of the nation's marine environment.
A Confluence of Factors for a Population Boom
A gentle winter and then a remarkably hot spring catalyzed unprecedented numbers of Mediterranean octopuses to settle along the southern coastline of England, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was approximately 13 times what we would usually anticipate in the waters around Cornwall,” explained an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were found in these waters this year – which is a significant rise from historical averages.”
The common octopus is found in British seas but usually so scarce it is rarely seen. An explosive growth is caused by a combination of gentle winter conditions and a warm breeding season. This perfect scenario meant a higher survival rate for young, potentially supported by large numbers of other marine life also recorded.
A Historic Event
Previously, such an octopus proliferation comparable was recorded in the 1950s, with archival data indicating the one before that was in 1900.
The sheer quantity of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – contrary to their normally lone nature – and ambulating along the seabed on their arm ends. A curious octopus was even filmed grabbing a diver's camera.
“The first time I dived in that area this year I saw five of these creatures,” they noted. “And these are big. Two kinds exist in UK waters. The curled octopus is smaller, the size of a ball, but these newcomers can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
Another mild winter heading into next year could lead to a second bloom in 2026, because in the past, under these conditions, events have occurred consecutively for two years running.
“However, it is unlikely, from previous blooms, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises at the moment so it’s hard to forecast.”
The report also noted further encouraging coastal sightings across British shores, including:
- Unprecedented numbers of grey seals recorded in Cumbria.
- Peak numbers of puffins on an island off Wales.
- The initial discovery of an unusual mollusc in a northern county, normally residing farther south.
- A variable blenny spotted off the coast of a southern county for the inaugural time.
Not All Positive News
Not everything was good news, however. “The period was framed by environmental disasters,” noted a conservation leader. “A significant shipping incident in March and a spill of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Dedicated individuals are putting in immense work to safeguard and rehabilitate our shorelines.”
