2025 Declared The Year for Octopuses Along England's Southern Shores.

Exceptionally high sightings of a remarkably clever cephalopod during the summer season have led to the designation of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas.

A Confluence of Factors for a Population Boom

A mild winter coupled with a very warm springtime triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The scale of the catch was of the order of about over a dozen times what we would usually anticipate in Cornish waters,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were found in these waters this year – which is a significant rise from what is typical.”

The common octopus is native to these waters but typically so rare it is infrequently encountered. A sudden increase is the result of a combination of gentle winter conditions and a warm breeding season. Such favorable circumstances meant a higher survival rate for young, potentially supported by large numbers of other marine life also recorded.

A Rare Phenomenon

Previously, an octopus bloom of this size was observed in the 1950s, with past documentation indicating the one before that occurred in 1900.

The sheer quantity of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and ambulating along the ocean floor on the tips of their limbs. One individual was even filmed grabbing submarine recording equipment.

“During a first dive there this year I saw five octopuses,” the specialist continued. “They are large specimens. Two kinds exist in these waters. One species is quite small, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Predictions and Marine Joy

Another mild winter heading into next year meant it was possible a repeat event next year, because historically, with such patterns, the blooms have repeated for two years running.

“However, it is unlikely, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”

The annual review also highlighted additional positive marine news around the UK coastline, including:

• A record number of gray seals observed in one northern region.
• Peak numbers of puffins on Skomer.
• The initial discovery of an unusual mollusc in Yorkshire, typically a southwestern species.
• A variable blenny found off the coast of Sussex for the inaugural time.

Not All Positive News

The year had its low points, however. “The period was framed by marine incidents,” noted a conservation leader. “A major tanker collision in the North Sea and a spill of industrial pellets off the southern coast were serious issues. Staff and volunteers are putting in immense work to safeguard and rehabilitate our coasts.”