2025 Proclaimed the 'Year of the Octopus' Along Britain's South Coast.

Exceptionally high observations of a supremely intelligent sea creature this past summer have led to the designation of 2025 as the octopus's year in a yearly report of UK coastal waters.

A Perfect Storm Driving a Surge

A mild winter followed by a very warm springtime triggered unprecedented numbers of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The reported landings was approximately thirteen times what we would typically see in Cornish waters,” commented a marine conservation officer. “Based on the totals, nearly a quarter of a million octopuses were present in British seas this year – representing a massive jump from the norm.”

*Octopus vulgaris* is found in UK waters but typically so rare it is infrequently encountered. A population bloom is the result of a combination of a mild winter and favorable spring temperatures. This perfect scenario meant more larvae, potentially supported by significant populations of spider crabs also recorded.

A Historic Event

The last time, such an octopus proliferation of this size was observed in 1950, with archival data indicating the previous major event happened in the turn of the 20th century.

The huge numbers of octopuses meant they could be easily spotted in nearshore environments for the first time in recent history. Video footage show octopuses congregating together – contrary to their normally lone nature – and “walking” along the bottom on their tentacle tips. One individual was even recorded reaching for submarine recording equipment.

“During a first dive there this year I saw five of these creatures,” the specialist continued. “They are sizeable. There are two types in the region. The curled octopus is smaller, the size of a ball, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Predictions and Marine Joy

Another mild winter heading into next year could lead to another surge next year, because historically, in similar situations, the blooms have repeated for two consecutive years.

“But, it's improbable, from previous blooms, that it will persist indefinitely,” they said. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

The assessment also highlighted additional positive marine news across British shores, including:

• Highest-ever counts of gray seals recorded in Cumbria.
• Record numbers of the iconic seabirds on a Welsh island.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
• A type of blenny spotted off the coast of Sussex for the first time.

Not All Positive News

Not everything was good news, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of plastic pollution off the Sussex coast served as stark reminders. Dedicated individuals are putting in immense work to defend and heal our marine habitats.”