2025 Proclaimed the 'Year of the Octopus' Off Britain's Southern Shores.

Unprecedented observations of a remarkably clever cephalopod this past summer have prompted the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter coupled with an exceptionally warm spring triggered unprecedented numbers of *Octopus vulgaris* to take up residence along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was of the order of about 13 times what we would usually anticipate in this region,” explained a marine life specialist. “When we added up the numbers, around 233 thousand octopuses were present in UK waters this year – which is a significant rise from the norm.”

*Octopus vulgaris* is native to UK waters but usually so scarce it is infrequently encountered. An explosive growth is caused by a combination of gentle winter conditions and favorable spring temperatures. This perfect scenario meant increased juvenile survival, maybe aided by abundant stocks of other marine life seen in the area.

A Rare Phenomenon

Previously, a population surge of this scale comparable was documented in the 1950s, with past documentation indicating the last bloom prior to that occurred in 1900.

The remarkable abundance of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Diver videos show octopuses being sociable – contrary to their normally lone nature – and moving along the ocean floor on their tentacle tips. A curious octopus was even filmed grabbing submarine recording equipment.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “And these are big. We have two species in the region. One species is smaller, the size of a ball, but these newcomers can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter this coming winter suggests the potential a second bloom the following year, because based on records, under these conditions, the blooms have repeated for two years in a row.

“Still, the chances are low, from previous blooms, that it will become a permanent fixture,” they said. “The ocean is full of surprises these days so it’s quite an unpredictable situation.”

The annual review also highlighted further encouraging coastal sightings around the UK coastline, including:

• A record number of grey seals recorded in Cumbria.
• Exceptional populations of the iconic seabirds on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A type of blenny discovered off the coast of Sussex for the first occasion.

A Note of Caution

Not everything was good news, however. “The period was framed by ecological challenges,” said a head of marine conservation. “A significant shipping incident in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our shorelines.”