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

Exceptionally high observations of a supremely intelligent sea creature over the summer months have prompted the designation of 2025 as the octopus's year in a yearly report of UK coastal waters.

A Perfect Storm for a Population Boom

An unusually warm winter followed by an exceptionally warm spring catalyzed a huge population of Mediterranean octopuses to settle along the shores from Cornwall to Devon, across the southwestern peninsula.

“The scale of the catch was approximately over a dozen times what we would typically see in the waters around Cornwall,” explained an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were caught in British seas this year – that’s a huge increase from the norm.”

The common octopus is native to these waters but typically so rare it is seldom observed. A sudden increase is the result of a combination of gentle winter conditions and a warm breeding season. Such favorable circumstances meant more larvae, potentially supported by abundant stocks of a favored prey species seen in the area.

An Uncommon Occurrence

The most recent occasion, such an octopus proliferation this significant was recorded in the 1950s, with historical records indicating the previous major event was in 1900.

The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Underwater recordings show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the ocean floor on their tentacle tips. One creature was even filmed grabbing an underwater camera.

“During a first dive off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “They are sizeable. There are two types in the region. One species 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 could lead to another surge the following year, because in the past, with such patterns, the blooms have repeated for two years in a row.

“Still, the chances are low, looking at history, that it will become a permanent fixture,” they said. “Marine life is unpredictable these days so it’s quite an unpredictable situation.”

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

• Highest-ever counts of grey seals observed in one northern region.
• Record numbers of puffins on an island off Wales.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
• A variable blenny discovered off the coast of Sussex for the first occasion.

A Note of Caution

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 southern coast highlighted ongoing threats. Staff and volunteers are working tirelessly to defend and heal our coasts.”