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

Record-breaking observations of one of the world's most intelligent invertebrates this past summer have prompted the declaration of 2025 as the octopus's year in a yearly report of the nation's marine environment.

Ideal Conditions Driving a Surge

An unusually warm winter followed by a remarkably hot spring prompted a huge population of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, across the southwestern peninsula.

“The reported landings was approximately 13 times what we would normally expect in Cornish waters,” stated a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were present in these waters this year – which is a significant rise from historical averages.”

The Mediterranean octopus is found in British seas but ordinarily in such small numbers it is infrequently encountered. A population bloom is the result of a combination of a mild winter and a warm breeding season. These ideal conditions meant increased juvenile survival, maybe aided by abundant stocks of other marine life noted in recent years.

A Historic Event

Previously, an octopus bloom of this size was documented in 1950, with archival data indicating the last bloom prior to that happened in the turn of the 20th century.

The sheer quantity of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Underwater recordings show octopuses gathering in groups – unlike their typical solitary behavior – and “walking” along the ocean floor on the tips of their limbs. A curious octopus 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. Two kinds exist in UK waters. The curled octopus is rather small, about the size of a football, but these common octopuses can be reaching impressive sizes.”

Future Prospects and Other Surprises

A second gentle winter heading into next year could lead to another surge in 2026, because in the past, in similar situations, events have occurred consecutively for two years in a row.

“However, it is unlikely, looking at history, that it will become a permanent fixture,” they stated. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

The annual review also celebrated further encouraging coastal sightings around the UK coastline, including:

• Unprecedented numbers of grey seals recorded in one northern region.
• Record numbers of puffins on a Welsh island.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
• A type of blenny spotted off the coast of a southern county for the inaugural time.

A Note of Caution

Challenges were also present, however. “The period was framed by environmental disasters,” noted a conservation leader. “A major tanker collision in March and an accidental discharge of tonnes of plastic biobeads off the southern coast were serious issues. Staff and volunteers are putting in immense work to defend and heal our coasts.”