2025 Declared the 'Year of the Octopus' Off England's South Coast.

Unprecedented sightings of a supremely intelligent sea creature over the summer months have prompted the designation of 2025 as “the year of the octopus” in an annual review of UK coastal waters.

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 England’s south coast, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly thirteen times what we would usually anticipate in the waters around Cornwall,” commented a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were found in UK waters this year – that’s a huge increase from what is typical.”

*Octopus vulgaris* is indigenous to British seas but usually so scarce it is infrequently encountered. A population bloom is caused by a combination of gentle winter conditions and a warm breeding season. This perfect scenario meant a higher survival rate for young, potentially supported by abundant stocks of spider crabs also recorded.

A Historic Event

Previously, an octopus bloom comparable was observed in the mid-20th century, with archival data indicating the previous major event occurred in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in coastal areas for a rare occurrence. Underwater recordings show octopuses gathering in groups – unlike their typical solitary behavior – and “walking” along the ocean floor on their arm ends. One creature was even filmed grabbing a diver's camera.

“During a first dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are sizeable. Two kinds exist in these waters. One species is smaller, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Future Prospects and Other Surprises

Another mild winter heading into next year could lead to a second bloom the following year, because historically, in similar situations, populations have surged again for two consecutive years.

“But, it's improbable, from previous blooms, that it will become a permanent fixture,” they cautioned. “The ocean is full of surprises currently so it’s hard to forecast.”

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

• Highest-ever counts of grey seals seen in one northern region.
• Record numbers of the iconic seabirds on an island off Wales.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A variable blenny discovered off the coast of a southern county for the first time.

Environmental Concerns

The year had its low points, however. “The calendar year was marked by environmental disasters,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are working tirelessly to safeguard and rehabilitate our marine habitats.”