2025 Declared the 'Year of the Octopus' Off Britain's South Coast.

Exceptionally high sightings of a supremely intelligent sea creature this past summer have resulted in the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.

Ideal Conditions Leading to an Explosion

A gentle winter followed by a very warm springtime triggered a massive influx of Mediterranean octopuses to settle along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The reported landings was approximately over a dozen times what we would typically see in the waters around Cornwall,” commented an ocean conservation expert. “Based on the totals, nearly a quarter of a million octopuses were found in these waters this year – which is a significant rise from the norm.”

The common octopus is indigenous to these waters but typically so rare it is rarely seen. A sudden increase is caused by the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, maybe aided by significant populations of other marine life seen in the area.

An Uncommon Occurrence

The last time, an octopus bloom of this size was observed in 1950, with historical records indicating the last bloom prior to that happened in the turn of the 20th century.

The sheer quantity of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Video footage show octopuses gathering in groups – they are usually solitary – and “walking” along the ocean floor on their tentacle tips. One individual was even seen investigating submarine recording equipment.

“On my initial dive in that area this year I saw five of these creatures,” the specialist continued. “They are sizeable. There are two types in UK waters. One species is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

A second gentle winter this coming winter suggests the potential another surge next year, because in the past, in similar situations, the blooms have repeated for two years in a row.

“But, it's improbable, based on past events, that it will go on for a long time,” they cautioned. “Marine life is unpredictable these days so it’s hard to forecast.”

The annual review also noted other “surprises, successes and joyful moments” across British shores, including:

• Highest-ever counts of gray seals seen in Cumbria.
• Record numbers of the iconic seabirds on an island off Wales.
• The first recording of an unusual mollusc in a northern county, normally residing farther south.
• A variable blenny discovered off the coast of Sussex for the first time.

Environmental Concerns

The year had its low points, however. “The year was bookended by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Dedicated individuals are putting in immense work to defend and heal our marine habitats.”