2025 Proclaimed The Year for Octopuses Off Britain's South Coast.

Record-breaking sightings of a supremely intelligent sea creature this past summer have prompted the designation of 2025 as “the year of the octopus” in an annual review of Britain’s seas.

A Confluence of Factors Driving a Surge

An unusually warm winter and then a remarkably hot spring triggered a massive influx 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 over a dozen times what we would typically see in this region,” stated an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were caught in British seas this year – that’s a huge increase from what is typical.”

The Mediterranean octopus is native to these waters but usually so scarce it is rarely seen. A sudden increase is the result of the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, maybe aided by large numbers of other marine life also recorded.

A Rare Phenomenon

The most recent occasion, such an octopus proliferation comparable was recorded in the 1950s, with archival data indicating the one before that occurred in 1900.

The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Diver videos show octopuses gathering in groups – they are usually solitary – and moving along the ocean floor on their tentacle tips. One individual was even recorded reaching for a diver's camera.

“On my initial dive in that area this year I saw five octopuses,” the officer added. “And these are big. We have two species in the region. The curled octopus is smaller, about the size of a football, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter going into 2026 meant it was possible a repeat event in 2026, because in the past, under these conditions, populations have surged again for two consecutive years.

“Still, the chances are low, from previous blooms, that it will become a permanent fixture,” they stated. “But the sea keeps giving us surprises these days so it’s hard to forecast.”

The report also noted other “surprises, successes and joyful moments” around the UK coastline, including:

• Highest-ever counts of gray seals recorded in one northern region.
• Record numbers of the iconic seabirds on an island off Wales.
• The initial discovery of a rare sea slug in a northern county, normally residing farther south.
• A variable blenny spotted off the coast of Sussex for the first occasion.

Not All Positive News

The year had its low points, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of industrial pellets off the southern coast highlighted ongoing threats. Staff and volunteers are putting in immense work to safeguard and rehabilitate our marine habitats.”