2025 Hailed as The Year for Octopuses Along England's South Coast.

Record-breaking observations of a supremely intelligent sea creature this past summer have led to the declaration of 2025 as “the year of the octopus” in a seasonal assessment of UK coastal waters.

A Perfect Storm for a Population Boom

A gentle winter followed by an exceptionally warm spring catalyzed a huge population of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.

“The volume of octopuses caught was of the order of about 13 times what we would usually anticipate in Cornish waters,” explained a marine conservation officer. “Based on the totals, nearly a quarter of a million octopuses were caught in UK waters this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is indigenous to British seas but usually so scarce it is rarely seen. A sudden increase is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, possibly in part fuelled by significant populations of spider crabs also recorded.

A Rare Phenomenon

The last time, such an octopus proliferation of this size was observed in 1950, with past documentation indicating the last bloom prior to that occurred in the turn of the 20th century.

The sheer quantity of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Video footage show octopuses gathering in groups – they are usually solitary – and “walking” along the bottom on the tips of their limbs. A curious octopus was even filmed grabbing an underwater camera.

“The first time I dived in that area this year I saw multiple octopuses,” they noted. “And these are big. Two kinds exist in these waters. One species is smaller, about the size of a football, but these common octopuses can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

Another mild winter going into 2026 suggests the potential another surge next year, because historically, under these conditions, the blooms have repeated for two years running.

“But, it's improbable, from previous blooms, that it will become a permanent fixture,” they cautioned. “Marine life is unpredictable at the moment so it’s hard to forecast.”

The annual review also noted further encouraging coastal sightings across British shores, including:

• Highest-ever counts of grey seals observed in one northern region.
• Peak numbers of the iconic seabirds on Skomer.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A Mediterranean fish species spotted off the coast of a southern county for the first occasion.

Environmental Concerns

Not everything was good news, however. “The year was bookended by environmental disasters,” stated an expert. “A significant shipping incident in the North Sea and a spill of plastic pollution off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to safeguard and rehabilitate our shorelines.”