2025 Declared 'The Octopus Year' Along England's Southern Shores.

Exceptionally high encounters of one of the world's most intelligent invertebrates this past summer have led to the designation of 2025 as “the year of the octopus” in an annual review of Britain’s seas.

A Perfect Storm Leading to an Explosion

A gentle winter coupled with a very warm springtime catalyzed a massive influx of *Octopus vulgaris* to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The scale of the catch was of the order of about thirteen times what we would usually anticipate in Cornish waters,” stated a marine life specialist. “Calculating the figures, nearly a quarter of a million octopuses were caught in these waters this year – representing a massive jump from historical averages.”

*Octopus vulgaris* is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is the result of the dual effect of a mild winter and a warm breeding season. These ideal conditions meant more larvae, maybe aided by large numbers of a favored prey species seen in the area.

An Uncommon Occurrence

Previously, such an octopus proliferation of this size was documented in 1950, with archival data indicating the one before that was in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Video footage show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the seabed on their arm ends. One individual was even recorded reaching for a diver's camera.

“The first time I dived off the Lizard peninsula this year I saw multiple octopuses,” the specialist continued. “They are sizeable. We have two species in UK waters. One species is rather small, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

Another mild winter going into 2026 meant it was possible a second bloom next year, because historically, with such patterns, populations have surged again for two years in a row.

“However, it is unlikely, based on past events, that it will become a permanent fixture,” they stated. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

The report also noted other “surprises, successes and joyful moments” around the UK coastline, including:

• Unprecedented numbers of gray seals seen in Cumbria.
• Record numbers of puffins on an island off Wales.
• The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
• A type of blenny discovered off the coast of a southern county for the inaugural time.

Not All Positive News

Challenges were also present, however. “The calendar year was marked by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and a spill of industrial pellets off the Sussex coast served as stark reminders. Conservation teams are working tirelessly to defend and heal our marine habitats.”