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

Exceptionally high sightings of one of the world's most intelligent invertebrates this past summer have led to the declaration of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment.

A Perfect Storm Driving a Surge

A gentle winter followed by a remarkably hot spring catalyzed a massive influx of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The reported landings was roughly 13 times what we would typically see in Cornish waters,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were found in these waters this year – representing a massive jump from the norm.”

The common octopus is native to UK waters but ordinarily in such small numbers it is rarely seen. A population bloom is caused by 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 seen in the area.

A Historic Event

The last time, an octopus bloom comparable was observed in the 1950s, with historical records indicating the previous major event occurred in 1900.

The sheer quantity of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – contrary to their normally lone nature – and “walking” along the seabed on the tips of their limbs. One individual was even seen investigating a diver's camera.

“On my initial dive there this year I saw multiple octopuses,” the officer added. “They are large specimens. We have two species in the region. The curled octopus is smaller, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”

Predictions and Marine Joy

Another mild winter heading into next year meant it was possible a repeat event next year, because historically, in similar situations, populations have surged again for two years running.

“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they cautioned. “Marine life is unpredictable these days so it’s hard to forecast.”

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

• Unprecedented numbers of gray seals seen in Cumbria.
• Exceptional populations of the iconic seabirds on a Welsh island.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, typically a southwestern species.
• A type of blenny spotted off the coast of a southern county for the inaugural time.

Not All Positive News

The year had its low points, however. “The period was framed by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and the release of industrial pellets off the Sussex coast served as stark reminders. Dedicated individuals are making huge efforts to safeguard and rehabilitate our shorelines.”