2025 Declared 'The Octopus Year' Along Britain's Southern Shores.

Unprecedented observations of one of the world's most intelligent invertebrates over the summer months have prompted the declaration of 2025 as the octopus's year in an annual review of UK coastal waters.

A Confluence of Factors Leading to an Explosion

A gentle winter and then a very warm springtime catalyzed a huge population of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.

“The volume of octopuses caught was of the order of about 13 times what we would typically see in Cornish waters,” commented a marine life specialist. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – which is a significant rise from what is typical.”

The Mediterranean octopus is native to these waters but typically so rare it is rarely seen. An explosive growth is the result of a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant more larvae, possibly in part fuelled by large numbers of other marine life also recorded.

A Rare Phenomenon

Previously, such an octopus proliferation of this size was documented in 1950, with historical records indicating the last bloom prior to that was in 1900.

The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Video footage show octopuses congregating together – contrary to their normally lone nature – and ambulating along the ocean floor on their arm ends. A curious octopus was even filmed grabbing submarine recording equipment.

“During a first dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “And these are big. Two kinds exist in these waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Future Prospects and Other Surprises

If conditions remain mild this coming winter could lead to a second bloom in 2026, because based on records, with such patterns, events have occurred consecutively for two years in a row.

“Still, the chances are low, based on past events, that it will become a permanent fixture,” they cautioned. “Marine life is unpredictable currently so it’s quite an unpredictable situation.”

The report also celebrated other “surprises, successes and joyful moments” across British shores, including:

• Unprecedented numbers of grey seals observed in Cumbria.
• Record numbers of the iconic seabirds on an island off Wales.
• The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species.
• A Mediterranean fish species discovered off the coast of a southern county for the first time.

Not All Positive News

The year had its low points, however. “The calendar year was marked by environmental disasters,” stated an expert. “A significant shipping incident in the North Sea and the release of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Staff and volunteers are making huge efforts to safeguard and rehabilitate our shorelines.”