2025 Declared The Year for Octopuses Off Britain's Southern Shores.

Unprecedented observations of a remarkably clever cephalopod this past summer have led to the declaration of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Perfect Storm Leading to an Explosion

A gentle winter coupled with an exceptionally warm spring catalyzed unprecedented numbers of *Octopus vulgaris* to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula.

“The scale of the catch was roughly over a dozen times what we would usually anticipate in Cornish waters,” stated a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were caught in these waters this year – that’s a huge increase from what is typical.”

*Octopus vulgaris* is found in UK waters but usually so scarce it is rarely seen. An explosive growth is attributed to a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by abundant stocks of spider crabs seen in the area.

A Historic Event

The last time, such an octopus proliferation this significant was observed in 1950, with archival data indicating the one before that was in the turn of the 20th century.

The sheer quantity of octopuses meant they could be easily spotted in nearshore environments for the first time in recent history. Underwater recordings show octopuses congregating together – unlike their typical solitary behavior – and moving along the bottom on the tips of their limbs. One creature was even recorded reaching for an underwater camera.

“On my initial dive in that area this year I saw five octopuses,” the specialist continued. “And these are big. Two kinds exist in these waters. One species is rather small, about the size of a football, but these common octopuses can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 suggests the potential a repeat event the following year, because based on records, with such patterns, the blooms have repeated for two years in a row.

“But, it's improbable, looking at history, that it will go on for a long time,” they stated. “The ocean is full of surprises at the moment so it’s a very uncertain scenario.”

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

• Unprecedented numbers of grey seals seen in Cumbria.
• Peak numbers of the iconic seabirds on a Welsh island.
• The first recording of an unusual mollusc in Yorkshire, usually found in the south-west.
• A Mediterranean fish species discovered off the coast of a southern county for the first time.

Not All Positive News

The year had its low points, however. “The calendar year was marked by environmental disasters,” stated an expert. “A significant shipping incident in the North Sea and an accidental discharge of plastic pollution off the southern coast highlighted ongoing threats. Staff and volunteers are making huge efforts to defend and heal our marine habitats.”