2025 Declared 'The Octopus Year' Along England's South Coast.

Record-breaking encounters of a supremely intelligent sea creature during the summer season have resulted in the naming of 2025 as “the year of the octopus” in a seasonal assessment of UK coastal waters.

A Perfect Storm Leading to an Explosion

A mild winter followed by a remarkably hot spring prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was approximately 13 times what we would normally expect in Cornish waters,” stated an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were found in British seas this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is indigenous to these waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by significant populations of other marine life also recorded.

A Rare Phenomenon

The last time, a population surge of this scale comparable was recorded in the 1950s, with archival data indicating the last bloom prior to that occurred in the turn of the 20th century.

The sheer quantity of octopuses meant they could be readily observed in nearshore environments for the first time in living memory. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the bottom on their tentacle tips. One creature was even filmed grabbing an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are sizeable. We have two species in these waters. One species is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.”

Predictions and Marine Joy

A second gentle winter heading into next year could lead to a repeat event next year, because in the past, in similar situations, the blooms have repeated for two years in a row.

“Still, the chances are low, looking at history, that it will persist indefinitely,” they said. “The ocean is full of surprises these days so it’s a very uncertain scenario.”

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

• Highest-ever counts of grey seals recorded in one northern region.
• Peak numbers of the iconic seabirds on an island off Wales.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, typically a southwestern species.
• A type of blenny found off the coast of a southern county for the first occasion.

Not All Positive News

Not everything was good news, however. “The year was bookended by ecological challenges,” noted a conservation leader. “A major tanker collision in the North Sea and a spill of plastic pollution off the southern coast served as stark reminders. Conservation teams are making huge efforts to safeguard and rehabilitate our coasts.”