2025 Declared the 'Year of the Octopus' Along England's Southern Shores.

Record-breaking encounters of one of the world's most intelligent invertebrates during the summer season have prompted the declaration of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.

A Confluence of Factors Leading to an Explosion

A gentle winter followed by a remarkably hot spring prompted a huge population of *Octopus vulgaris* to settle along the shores from Cornwall to Devon, across the southwestern peninsula.

“The reported landings was of the order of about over a dozen times what we would usually anticipate in this region,” stated a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were present in UK waters this year – representing a massive jump from what is typical.”

*Octopus vulgaris* is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A population bloom is attributed to a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, potentially supported by significant populations of spider crabs also recorded.

An Uncommon Occurrence

The most recent occasion, an octopus bloom of this size was observed in 1950, with archival data indicating the one before that happened in 1900.

The huge numbers of octopuses meant they could be easily spotted in nearshore environments for the first time in living memory. Diver videos show octopuses congregating together – they are usually solitary – and moving along the ocean floor on their tentacle tips. One individual was even seen investigating an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are sizeable. We have two species in UK waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

Another mild winter going into 2026 suggests the potential a repeat event next year, because in the past, under these conditions, the blooms have repeated for two years running.

“However, it is unlikely, 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 annual review also noted additional positive marine news across British shores, including:

• Highest-ever counts of gray seals observed in one northern region.
• Exceptional populations of puffins on an island off Wales.
• A first-ever sighting of a rare sea slug in a northern county, 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,” noted a conservation leader. “A major tanker collision in March and a spill of tonnes of plastic biobeads off the Sussex coast were serious issues. Staff and volunteers are working tirelessly to protect and restore our shorelines.”