2025 Proclaimed the 'Year of the Octopus' Along Britain's South Coast.

Exceptionally high observations of a remarkably clever cephalopod during the summer season have prompted the designation of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Confluence of Factors Leading to an Explosion

A gentle winter coupled with a remarkably hot spring triggered unprecedented numbers of *Octopus vulgaris* to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly thirteen times what we would normally expect in Cornish waters,” explained a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – which is a significant rise from the norm.”

The common octopus is indigenous to British seas but usually so scarce it is seldom observed. A sudden increase is the result of a combination of gentle winter conditions and favorable spring temperatures. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs also recorded.

A Rare Phenomenon

Previously, an octopus bloom this significant was recorded in 1950, with archival data indicating the one before that was in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be easily spotted in shallow waters for the first time in living memory. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and moving along the bottom on their arm ends. A curious octopus was even recorded reaching for a diver's camera.

“During a first dive there this year I saw five of these creatures,” the specialist continued. “They are large specimens. There are two types in the region. 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.”

Predictions and Marine Joy

Another mild winter this coming winter meant it was possible another surge in 2026, because based on records, under these conditions, the blooms have repeated for two years running.

“But, it's improbable, based on past events, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”

The annual review also celebrated additional positive marine news along the coast, including:

• A record number of gray seals seen in Cumbria.
• Exceptional populations of puffins on Skomer.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
• A type of blenny discovered off the coast of a southern county for the inaugural time.

Environmental Concerns

The year had its low points, however. “The calendar year was marked by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of plastic pollution off the Sussex coast were serious issues. Dedicated individuals are putting in immense work to defend and heal our coasts.”