2025 Proclaimed the 'Year of the Octopus' Off England's South Coast.
Exceptionally high encounters of one of the world's most intelligent invertebrates over the summer months have led to the naming 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
An unusually warm winter followed by an exceptionally warm spring prompted a huge population of *Octopus vulgaris* to establish themselves along the southern coastline of England, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was approximately over a dozen times what we would normally expect in the waters around Cornwall,” explained a marine life specialist. “Based on the totals, nearly a quarter of a million octopuses were found in these waters this year – which is a significant rise from what is typical.”
*Octopus vulgaris* is found in UK waters but typically so rare it is rarely seen. A sudden increase is the result of the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, potentially supported by significant populations of a favored prey species seen in the area.
An Uncommon Occurrence
The last time, an octopus bloom of this size was recorded in 1950, with past documentation indicating the one before that was in 1900.
The sheer quantity of octopuses meant they could be readily observed in nearshore environments for the first time in recent history. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the bottom on their tentacle tips. A curious octopus was even seen investigating an underwater camera.
“The first time I dived there this year I saw five of these creatures,” they noted. “And these are big. There are two types in the region. The curled octopus is smaller, about the size of a football, but the *Octopus vulgaris* can be with a span of 1.5 meters.”
Looking Ahead & Coastal Highlights
If conditions remain mild heading into next year meant it was possible a repeat event in 2026, because in the past, under these conditions, populations have surged again for two consecutive years.
“However, it is unlikely, from previous blooms, that it will persist indefinitely,” they stated. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”
The report also highlighted other “surprises, successes and joyful moments” around the UK coastline, including:
- Unprecedented numbers of gray seals seen in one northern region.
- Exceptional populations of the iconic seabirds on a Welsh island.
- A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
- A Mediterranean fish species discovered off the coast of Sussex for the first time.
A Note of Caution
The year had its low points, however. “The calendar year was marked by ecological challenges,” noted a conservation leader. “A significant shipping incident in March and a spill of plastic pollution off the Sussex coast highlighted ongoing threats. Staff and volunteers are working tirelessly to defend and heal our shorelines.”