2025 Declared 'The Octopus Year' Along England's Southern Shores.

Record-breaking observations of a remarkably clever cephalopod this past summer have resulted in the designation of 2025 as the year for octopuses in an annual review of UK coastal waters.

A Confluence of Factors Driving a Surge

A mild winter coupled with a remarkably hot spring prompted a huge population of Mediterranean octopuses to take up residence along England’s south coast, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was approximately 13 times what we would normally expect in Cornish waters,” commented an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were caught in these waters this year – that’s a huge increase from historical averages.”

The common octopus is native to UK waters but usually so scarce it is seldom observed. An explosive growth is attributed to the dual effect of a mild winter and favorable spring temperatures. This perfect scenario meant more larvae, potentially supported by abundant stocks of a favored prey species also recorded.

A Historic Event

The last time, such an octopus proliferation this significant was observed in the mid-20th century, with archival data indicating the previous major event was in 1900.

The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and ambulating along the bottom on the tips of their limbs. One creature was even recorded reaching for submarine recording equipment.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “They are large specimens. Two kinds exist in the region. The curled octopus is quite small, about the size of a football, but these newcomers can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

Another mild winter heading into next year suggests the potential a second bloom the following year, because based on records, in similar situations, the blooms have repeated for two consecutive years.

“However, it is unlikely, looking at history, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.”

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

• Highest-ever counts of gray seals recorded in one northern region.
• Exceptional populations of puffins on a Welsh island.
• The first recording of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
• A type of blenny found off the coast of a southern county for the first occasion.

A Note of Caution

Challenges were also present, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A significant shipping incident in March and an accidental discharge of industrial pellets off the Sussex coast highlighted ongoing threats. Dedicated individuals are working tirelessly to safeguard and rehabilitate our coasts.”