2025 Hailed as The Year for Octopuses Along England's Southern Shores.

Record-breaking sightings of a supremely intelligent sea creature during the summer season have resulted in the declaration of 2025 as the octopus's year in a yearly report of Britain’s seas.

A Confluence of Factors for a Population Boom

An unusually warm winter coupled with a remarkably hot spring prompted a huge population of common octopuses (*Octopus vulgaris*) to take up residence along England’s south coast, spanning the Cornish and Devonian coasts.

“The scale of the catch was of the order of about over a dozen times what we would usually anticipate in this region,” stated a marine life specialist. “Calculating the figures, around 233 thousand octopuses were found in UK waters this year – representing a massive jump from the norm.”

*Octopus vulgaris* is found in UK waters but ordinarily in such small numbers it is infrequently encountered. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, potentially supported by abundant stocks of spider crabs seen in the area.

An Uncommon Occurrence

The most recent occasion, an octopus bloom this significant was observed in 1950, with archival data indicating the last bloom prior to that occurred in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Video footage show octopuses congregating together – they are usually solitary – and moving along the bottom on the tips of their limbs. One individual was even recorded reaching for submarine recording equipment.

“On my initial dive in that area this year I saw five octopuses,” they noted. “They are sizeable. We have two species in UK waters. One species is quite small, the size of a ball, but these common octopuses can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter going into 2026 could lead to a second bloom in 2026, because historically, with such patterns, the blooms have repeated for two consecutive years.

“But, it's improbable, looking at history, that it will become a permanent fixture,” they stated. “The ocean is full of surprises currently so it’s hard to forecast.”

The report also highlighted other “surprises, successes and joyful moments” across British shores, including:

• Highest-ever counts of grey seals seen in one northern region.
• Record numbers of puffins on a Welsh island.
• The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A type of blenny discovered off the coast of a southern county for the inaugural time.

Not All Positive News

Challenges were also present, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A significant shipping incident in the North Sea and an accidental discharge of tonnes of plastic biobeads off the southern coast served as stark reminders. Dedicated individuals are making huge efforts to safeguard and rehabilitate our coasts.”