2025 Declared the 'Year of the Octopus' Off Britain's South Coast.

Unprecedented sightings of a remarkably clever cephalopod during the summer season have led to the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.

A Perfect Storm Leading to an Explosion

A mild winter followed by an exceptionally warm spring triggered unprecedented numbers of Mediterranean octopuses to establish themselves along the shores from Cornwall to Devon, across the southwestern peninsula.

“The reported landings was of the order of about thirteen times what we would normally expect in Cornish waters,” stated a marine life specialist. “Based on the totals, approximately 233,000 octopuses were present in UK waters this year – that’s a huge increase from historical averages.”

The common octopus is native to these waters but usually so scarce it is infrequently encountered. A population bloom is the result of a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by abundant stocks of a favored prey species seen in the area.

A Rare Phenomenon

The most recent occasion, such an octopus proliferation of this size was recorded in the mid-20th century, with past documentation indicating the previous major event occurred in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in shallow waters for the first time in recent history. Underwater recordings show octopuses gathering in groups – they are usually solitary – and “walking” along the bottom on their tentacle tips. A curious octopus was even recorded reaching for submarine recording equipment.

“On my initial dive there this year I saw five of these creatures,” they noted. “They are sizeable. There are two types in these waters. The curled octopus is quite small, about the size of a football, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

Another mild winter heading into next year could lead to a repeat event in 2026, because based on records, in similar situations, populations have surged again for two years in a row.

“However, it is unlikely, from previous blooms, that it will persist indefinitely,” they stated. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”

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

• A record number of grey seals recorded in Cumbria.
• Peak numbers of the iconic seabirds on an island off Wales.
• The first recording of a rare sea slug in Yorkshire, typically a southwestern species.
• A type of blenny found off the coast of a southern county for the first occasion.

A Note of Caution

Not everything was good news, however. “The year was bookended by marine incidents,” stated an expert. “A significant shipping incident in March and a spill of plastic pollution off the southern coast were serious issues. Staff and volunteers are putting in immense work to protect and restore our coasts.”