2025 Hailed as The Year for Octopuses Off England's South Coast.
Exceptionally high observations of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as “the year of the octopus” in a seasonal assessment of UK coastal waters.
A Confluence of Factors Driving a Surge
An unusually warm winter coupled with an exceptionally warm spring prompted a huge population of *Octopus vulgaris* to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was of the order of about thirteen times what we would normally expect in the waters around Cornwall,” stated an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were caught in British seas this year – representing a massive jump from the norm.”
The Mediterranean octopus is found in British seas but typically so rare it is infrequently encountered. A population bloom is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, possibly in part fuelled by significant populations of a favored prey species seen in the area.
An Uncommon Occurrence
Previously, an octopus bloom this significant was recorded in the 1950s, with historical records indicating the last bloom prior to that occurred in 1900.
The huge numbers of octopuses meant they could be frequently seen in shallow waters for the first time in recent history. Video footage show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the ocean floor on their arm ends. A curious octopus was even filmed grabbing submarine recording equipment.
“During a first dive in that area this year I saw five of these creatures,” the officer added. “And these are big. There are two types in the region. One species is quite small, about the size of a football, but these common octopuses can be up to a metre and a half wide.”
Future Prospects and Other Surprises
If conditions remain mild this coming winter suggests the potential a second bloom in 2026, because based on records, in similar situations, events have occurred consecutively for two years in a row.
“However, it is unlikely, looking at history, that it will persist indefinitely,” they cautioned. “Marine life is unpredictable at the moment so it’s hard to forecast.”
The annual review also noted additional positive marine news around the UK coastline, including:
- Highest-ever counts of gray seals observed in Cumbria.
- Peak numbers of puffins on an island off Wales.
- The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
- A type of blenny found off the coast of Sussex for the first time.
Environmental Concerns
The year had its low points, however. “The period was framed by environmental disasters,” noted a conservation leader. “A major tanker collision in March and the release of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to protect and restore our coasts.”