2025 Proclaimed the 'Year of the Octopus' Along Britain's Southern Shores.

Record-breaking encounters of one of the world's most intelligent invertebrates during the summer season have led to the declaration of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter coupled with a remarkably hot spring catalyzed a massive influx of Mediterranean octopuses to settle along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly over a dozen times what we would usually anticipate in this region,” commented an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were present in British seas this year – which is a significant rise from the norm.”

*Octopus vulgaris* is native to British seas but usually so scarce it is infrequently encountered. A sudden increase is caused by a combination of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by abundant stocks of a favored prey species seen in the area.

An Uncommon Occurrence

Previously, such an octopus proliferation of this size was documented in the 1950s, with archival data indicating the last bloom prior to that happened in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be frequently seen in nearshore environments for the first time in recent history. Diver videos show octopuses congregating together – contrary to their normally lone nature – and “walking” along the seabed on their arm ends. One individual was even filmed grabbing a diver's camera.

“The first time I dived in that area this year I saw multiple octopuses,” the specialist continued. “They are sizeable. We have two species in these waters. One species is rather small, about the size of a football, but these common octopuses can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter heading into next year could lead to a repeat event in 2026, because based on records, with such patterns, events have occurred consecutively for two years in a row.

“Still, the chances are low, from previous blooms, that it will become a permanent fixture,” they stated. “The ocean is full of surprises 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 seen in Cumbria.
• Peak numbers of puffins on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A type of blenny discovered off the coast of a southern county for the first time.

Environmental Concerns

Not everything was good news, however. “The period was framed by environmental disasters,” noted a conservation leader. “A significant shipping incident in the North Sea and the release of industrial pellets off the Sussex coast highlighted ongoing threats. Dedicated individuals are putting in immense work to defend and heal our shorelines.”