2025 Hailed as The Year for Octopuses Along England's South Coast.
Unprecedented encounters of a supremely intelligent sea creature over the summer months have prompted the designation of 2025 as the octopus's year in an annual review of UK coastal waters.
A Confluence of Factors Driving a Surge
An unusually warm winter followed by a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, 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,” stated a marine life specialist. “When we added up the numbers, nearly a quarter of a million octopuses were present in British seas this year – representing a massive jump from historical averages.”
The Mediterranean octopus is indigenous to British seas but ordinarily in such small numbers it is rarely seen. A sudden increase is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, maybe aided by large numbers of other marine life also recorded.
A Rare Phenomenon
The most recent occasion, such an octopus proliferation of this size was observed in 1950, with historical records indicating the one before that happened in 1900.
The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and ambulating along the ocean floor on their tentacle tips. One creature was even recorded reaching for submarine recording equipment.
“On my initial dive off the Lizard peninsula this year I saw five octopuses,” the specialist continued. “They are large specimens. Two kinds exist in the region. One species is quite small, about the size of a football, but these common octopuses can be reaching impressive sizes.”
Looking Ahead & Coastal Highlights
Another mild winter heading into next year could lead to a repeat event next year, because based on records, under these conditions, events have occurred consecutively for two years running.
“Still, the chances are low, looking at history, that it will go on for a long time,” they said. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”
The annual review also highlighted other “surprises, successes and joyful moments” along the coast, including:
- Highest-ever counts of gray seals recorded in Cumbria.
- Peak numbers of puffins on a Welsh island.
- The first recording of the *Capellinia fustifera* nudibranch in Yorkshire, typically a southwestern species.
- A variable blenny discovered off the coast of a southern county for the first occasion.
A Note of Caution
Challenges were also present, however. “The period was framed by marine incidents,” stated an expert. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Dedicated individuals are working tirelessly to defend and heal our shorelines.”