2025 Proclaimed 'The Octopus Year' Off England's Southern Shores.

Unprecedented observations of a supremely intelligent sea creature this past summer have led to the naming of 2025 as “the year of the octopus” in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

An unusually warm winter and then a very warm springtime triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.

“The volume of octopuses caught was of the order of about over a dozen times what we would normally expect in the waters around Cornwall,” explained a marine life specialist. “When we added up the numbers, around 233 thousand octopuses were caught in these waters this year – which is a significant rise from historical averages.”

The Mediterranean octopus is indigenous to these waters but usually so scarce it is seldom observed. A population bloom is caused by the dual effect 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 spider crabs seen in the area.

A Rare Phenomenon

The most recent occasion, a population surge of this scale comparable was documented in 1950, with past documentation indicating the one before that occurred in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in coastal areas for the first time in recent history. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the ocean floor on their arm ends. One creature was even filmed grabbing an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “They are large specimens. Two kinds exist in these waters. The curled octopus is smaller, football-sized, but these common octopuses can be reaching impressive sizes.”

Future Prospects and Other Surprises

A second gentle winter this coming winter could lead to another surge next year, because in the past, with such patterns, events have occurred consecutively for two years in a row.

“But, it's improbable, based on past events, that it will become a permanent fixture,” they said. “The ocean is full of surprises at the moment so it’s a very uncertain scenario.”

The annual review also celebrated further encouraging coastal sightings along the coast, including:

• Unprecedented numbers of gray seals recorded in Cumbria.
• Peak numbers of puffins on an island off Wales.
• The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, typically a southwestern species.
• A Mediterranean fish species spotted off the coast of a southern county for the inaugural time.

A Note of Caution

Challenges were also present, however. “The year was bookended by ecological challenges,” stated an expert. “A significant shipping incident in March and a spill 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 shorelines.”