2025 Proclaimed the 'Year of the Octopus' Off England's Southern Shores.

Exceptionally high sightings of a remarkably clever cephalopod over the summer months have resulted in the declaration of 2025 as the octopus's year in a yearly report of Britain’s seas.

A Confluence of Factors Driving a Surge

A gentle winter and then a remarkably hot spring triggered unprecedented numbers 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 of the order of about over a dozen times what we would typically see in Cornish waters,” explained an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were caught in British seas this year – that’s a huge increase from the norm.”

The Mediterranean octopus is native to these waters but ordinarily in such small numbers it is infrequently encountered. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, maybe aided by large numbers of other marine life noted in recent years.

An Uncommon Occurrence

Previously, such an octopus proliferation comparable was observed in the mid-20th century, with archival data indicating the previous major event occurred in the turn of the 20th century.

The sheer quantity of octopuses meant they could be readily observed in nearshore environments for the first time in living memory. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and moving along the ocean floor on the tips of their limbs. A curious octopus was even filmed grabbing submarine recording equipment.

“The first time I dived off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “They are large specimens. Two kinds exist in UK waters. The curled octopus is quite small, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Predictions and Marine Joy

Another mild winter going into 2026 suggests the potential a second bloom next year, because based on records, in similar situations, events have occurred consecutively for two years in a row.

“But, it's improbable, from previous blooms, that it will become a permanent fixture,” they stated. “Marine life is unpredictable at the moment so it’s a very uncertain scenario.”

The annual review also noted additional positive marine news around the UK coastline, including:

• Highest-ever counts of grey seals seen in one northern region.
• Record numbers of the iconic seabirds on Skomer.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
• A variable blenny discovered off the coast of Sussex for the inaugural time.

Environmental Concerns

Challenges were also present, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and a spill of industrial pellets off the southern coast highlighted ongoing threats. Conservation teams are making huge efforts to safeguard and rehabilitate our marine habitats.”