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

Record-breaking sightings of a supremely intelligent sea creature during the summer season have led to the naming of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.

A Perfect Storm Driving a Surge

An unusually warm winter followed by a very warm springtime catalyzed a huge population of common octopuses (*Octopus vulgaris*) to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The reported landings was roughly thirteen times what we would usually anticipate in Cornish waters,” explained an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were present in British seas this year – which is a significant rise from the norm.”

The Mediterranean octopus is found in these waters but usually so scarce it is infrequently encountered. An explosive growth is the result of the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by abundant stocks of other marine life also recorded.

A Rare Phenomenon

The most recent occasion, such an octopus proliferation comparable was observed in 1950, with past documentation indicating the previous major event occurred in the turn of the 20th century.

The sheer quantity of octopuses meant they could be easily spotted in shallow waters for the first time in recent history. Underwater recordings show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the ocean floor on their arm ends. A curious octopus was even filmed grabbing a diver's camera.

“On my initial dive there this year I saw five octopuses,” they noted. “And these are big. There are two types in the region. The curled octopus is quite small, about the size of a football, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 could lead to another surge in 2026, because historically, under these conditions, events have occurred consecutively for two years running.

“Still, the chances are low, looking at history, that it will persist indefinitely,” they said. “The ocean is full of surprises these days so it’s hard to forecast.”

The report also noted additional positive marine news along the coast, including:

• A record number of grey seals observed in one northern region.
• Record numbers of puffins on an island off Wales.
• A first-ever sighting of an unusual mollusc in Yorkshire, usually found in the south-west.
• A type of blenny spotted off the coast of Sussex for the first occasion.

Not All Positive News

The year had its low points, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are making huge efforts to defend and heal our marine habitats.”