2025 Proclaimed the 'Year of the Octopus' Off England's Southern Shores.

Exceptionally high sightings of one of the world's most intelligent invertebrates during the summer season have prompted the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters.

A Confluence of Factors for a Population Boom

A gentle winter coupled with a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The reported landings was of the order of about thirteen times what we would normally expect in this region,” commented an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were present in these waters this year – which is a significant rise from the norm.”

The Mediterranean octopus is found in UK waters but usually so scarce it is rarely seen. A population bloom is caused by the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by abundant stocks of a favored prey species also recorded.

A Rare Phenomenon

Previously, such an octopus proliferation comparable was recorded in the 1950s, with past documentation indicating the previous major event was in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the bottom on the tips of their limbs. A curious octopus was even recorded reaching for an underwater camera.

“On my initial dive there this year I saw multiple octopuses,” they noted. “They are sizeable. Two kinds exist in UK waters. One species is rather small, the size of a ball, but the *Octopus vulgaris* can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 suggests the potential a repeat event next year, because based on records, with such patterns, events have occurred consecutively for two years running.

“Still, the chances are low, looking at history, that it will persist indefinitely,” they stated. “The ocean is full of surprises currently so it’s hard to forecast.”

The annual review also noted further encouraging coastal sightings around the UK coastline, including:

• Unprecedented numbers of grey seals observed in Cumbria.
• Peak numbers of the iconic seabirds on a Welsh island.
• A first-ever sighting of an unusual mollusc in Yorkshire, normally residing farther south.
• A Mediterranean fish species found off the coast of a southern county for the first occasion.

Not All Positive News

Not everything was good news, however. “The calendar year was marked by environmental disasters,” noted a conservation leader. “A major tanker collision in March and the release of industrial pellets off the southern coast highlighted ongoing threats. Dedicated individuals are making huge efforts to defend and heal our marine habitats.”