2025 Declared The Year for Octopuses Off Britain's South Coast.

Record-breaking observations of one of the world's most intelligent invertebrates this past summer have resulted in the naming 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 *Octopus vulgaris* to establish themselves along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The scale of the catch was approximately thirteen times what we would usually anticipate in Cornish waters,” commented an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were present in British seas this year – that’s a huge increase from the norm.”

The Mediterranean octopus is found in these waters but ordinarily in such small numbers it is rarely seen. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, potentially supported by significant populations of other marine life noted in recent years.

A Historic Event

Previously, an octopus bloom comparable was observed in the mid-20th century, with historical records indicating the one before that was in 1900.

The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in living memory. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the ocean floor on their arm ends. A curious octopus was even seen investigating an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw five octopuses,” the specialist continued. “And these are big. We have two species in UK waters. One species is rather small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter this coming winter suggests the potential another surge the following year, because based on records, in similar situations, populations have surged again for two years running.

“But, it's improbable, based on past events, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

The annual review also highlighted other “surprises, successes and joyful moments” along the coast, including:

• Unprecedented numbers of grey seals recorded in one northern region.
• Exceptional populations of puffins on an island off Wales.
• The initial discovery of a rare sea slug in a northern county, normally residing farther south.
• A Mediterranean fish species found off the coast of Sussex for the first time.

Not All Positive News

Not everything was good news, however. “The period was framed by ecological challenges,” stated an expert. “A major tanker collision in March and the release of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Conservation teams are putting in immense work to defend and heal our marine habitats.”