2025 Declared The Year for Octopuses Off Britain's Southern Shores.

Record-breaking encounters of a remarkably clever cephalopod this past summer have resulted in the naming of 2025 as the year for octopuses in a yearly report of UK coastal waters.

A Perfect Storm for a Population Boom

A gentle winter coupled with an exceptionally warm spring triggered a huge population of *Octopus vulgaris* to establish themselves along England’s south coast, from Penzance in Cornwall to south Devon.

“The scale of the catch was approximately 13 times what we would typically see in Cornish waters,” explained a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were caught in British seas this year – representing a massive jump from historical averages.”

*Octopus vulgaris* is indigenous to British seas but usually so scarce it is infrequently encountered. An explosive growth is the result of the dual effect of gentle winter conditions and a warm breeding season. Such favorable circumstances meant increased juvenile survival, potentially supported by abundant stocks of a favored prey species also recorded.

A Rare Phenomenon

The most recent occasion, an octopus bloom this significant was recorded in the 1950s, with archival data indicating the previous major event was in 1900.

The sheer quantity of octopuses meant they could be easily spotted in coastal areas for the first time in recent history. Video footage show octopuses congregating together – they are usually solitary – and ambulating along the ocean floor on their tentacle tips. 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 specialist continued. “They are sizeable. We have two species in UK waters. The curled octopus is rather small, about the size of a football, but these common octopuses can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 meant it was possible a second bloom in 2026, because in the past, in similar situations, events have occurred consecutively for two years running.

“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they stated. “The ocean is full of surprises currently so it’s hard to forecast.”

The report also noted further encouraging coastal sightings along the coast, including:

• Highest-ever counts of grey seals seen in Cumbria.
• Peak numbers of puffins 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.

Not All Positive News

The year had its low points, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of plastic pollution off the Sussex coast served as stark reminders. Conservation teams are putting in immense work to defend and heal our coasts.”