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

Record-breaking sightings of a remarkably clever cephalopod this past summer have resulted in the naming of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.

A Confluence of Factors Leading to an Explosion

A mild winter followed by a remarkably hot spring prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The scale of the catch was approximately thirteen times what we would typically see in this region,” stated a marine conservation officer. “Based on the totals, around 233 thousand octopuses were found in these waters this year – that’s a huge increase from historical averages.”

The common octopus is native to British seas but usually so scarce it is rarely seen. An explosive growth is caused by the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, potentially supported by significant populations of a favored prey species also recorded.

A Rare Phenomenon

The last time, an octopus bloom comparable was documented in the 1950s, with historical records indicating the last bloom prior to that happened in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be easily spotted in coastal areas for the first time in recent history. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the seabed on the tips of their limbs. A curious octopus was even recorded reaching for a diver's camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “They are large specimens. Two kinds exist in these waters. The curled octopus is rather small, the size of a ball, but the *Octopus vulgaris* can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

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

“However, it is unlikely, from previous blooms, that it will go on for a long time,” they stated. “The ocean is full of surprises currently so it’s quite an unpredictable situation.”

The annual review also highlighted further encouraging coastal sightings along the coast, including:

• Highest-ever counts of grey seals seen in Cumbria.
• Record numbers of puffins on Skomer.
• The initial discovery of a rare sea slug in Yorkshire, usually found in the south-west.
• A type of blenny discovered off the coast of Sussex for the first time.

A Note of Caution

Challenges were also present, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of plastic pollution off the southern coast served as stark reminders. Staff and volunteers are making huge efforts to safeguard and rehabilitate our coasts.”