2025 Proclaimed 'The Octopus Year' Off England's South Coast.

Unprecedented sightings of one of the world's most intelligent invertebrates this past summer have prompted the declaration of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.

A Perfect Storm Leading to an Explosion

An unusually warm winter and then a very warm springtime catalyzed a massive influx of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was approximately over a dozen times what we would usually anticipate in the waters around Cornwall,” explained a marine life specialist. “Based on the totals, nearly a quarter of a million octopuses were found in UK 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 infrequently encountered. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant increased juvenile survival, maybe aided by abundant stocks of spider crabs also recorded.

An Uncommon Occurrence

Previously, a population surge of this scale of this size was recorded in 1950, with historical records indicating the last bloom prior to that happened in 1900.

The remarkable abundance of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Underwater recordings show octopuses being sociable – they are usually solitary – and moving along the ocean floor on the tips of their limbs. One creature was even recorded reaching for a diver's camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “They are sizeable. We have two species in UK waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Future Prospects and Other Surprises

Another mild winter heading into next year could lead to a repeat event the following year, because in the past, in similar situations, events have occurred consecutively for two years running.

“But, it's improbable, based on past events, that it will become a permanent fixture,” they stated. “But the sea keeps giving us surprises these days so it’s hard to forecast.”

The annual review also celebrated additional positive marine news along the coast, including:

• Highest-ever counts of gray seals recorded in Cumbria.
• Exceptional populations of puffins on a Welsh island.
• The first recording of a rare sea slug in Yorkshire, usually found in the south-west.
• A type of blenny found off the coast of Sussex for the first time.

Not All Positive News

Not everything was good news, however. “The year was bookended by environmental disasters,” noted a conservation leader. “A major tanker collision in the North Sea and the release of plastic pollution off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to defend and heal our shorelines.”