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

Record-breaking observations of a supremely intelligent sea creature this past summer have resulted in the declaration of 2025 as “the year of the octopus” in a seasonal assessment of Britain’s seas.

A Perfect Storm Leading to an Explosion

An unusually warm winter coupled with a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to take up residence along England’s south coast, across the southwestern peninsula.

“The reported landings was of the order of about 13 times what we would typically see in the waters around Cornwall,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were present in these waters this year – that’s a huge increase from what is typical.”

The Mediterranean octopus is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is the result of the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, maybe aided by large numbers of spider crabs also recorded.

An Uncommon Occurrence

Previously, a population surge of this scale this significant was documented in the 1950s, with historical records indicating the previous major event was in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Video footage show octopuses being sociable – unlike their typical solitary behavior – and moving along the bottom on their tentacle tips. One creature was even seen investigating a diver's camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. We have two species in these waters. One species 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

A second gentle winter going into 2026 meant it was possible a second bloom next year, because based on records, under these conditions, the blooms have repeated for two years in a row.

“Still, the chances are low, based on past events, that it will go on for a long time,” they said. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

The report also celebrated further encouraging coastal sightings across British shores, including:

• A record number of gray seals observed in Cumbria.
• Peak numbers of puffins on Skomer.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
• A Mediterranean fish species discovered off the coast of Sussex for the first occasion.

A Note of Caution

The year had its low points, however. “The year was bookended by ecological challenges,” stated an expert. “A major tanker collision in the North Sea and an accidental discharge of tonnes of plastic biobeads off the southern coast were serious issues. Dedicated individuals are putting in immense work to protect and restore our marine habitats.”