🔗 Share this article 2025 Hailed as The Year for Octopuses Off England's Southern Shores. Unprecedented encounters of a remarkably clever cephalopod this past summer have prompted the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters. A Confluence of Factors for a Population Boom A mild winter coupled with a remarkably hot spring prompted a huge population of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The reported landings was approximately thirteen times what we would typically see in the waters around Cornwall,” explained a marine conservation officer. “Calculating the figures, nearly a quarter of a million octopuses were present in UK waters this year – representing a massive jump from what is typical.” *Octopus vulgaris* is native to UK waters but usually so scarce it is rarely seen. A sudden increase is caused by the dual effect 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 noted in recent years. A Rare Phenomenon The most recent occasion, a population surge of this scale of this size was recorded in the mid-20th century, with historical records indicating the previous major event happened in 1900. The huge numbers of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Diver videos show octopuses congregating together – contrary to their normally lone nature – and ambulating along the seabed on the tips of their limbs. One individual was even recorded reaching for submarine recording equipment. “During a first dive off the Lizard peninsula this year I saw multiple octopuses,” they noted. “They are sizeable. We have two species in the region. One species is quite small, the size of a ball, but these newcomers can be with a span of 1.5 meters.” Future Prospects and Other Surprises If conditions remain mild heading into next year could lead to another surge next year, because based on records, in similar situations, 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 said. “Marine life is unpredictable at the moment so it’s hard to forecast.” The assessment also noted additional positive marine news around the UK coastline, including: A record number of gray seals seen in Cumbria. Exceptional populations of the iconic seabirds on Skomer. The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species. A variable blenny spotted off the coast of Sussex for the first time. A Note of Caution Challenges were also present, however. “The period was framed by environmental disasters,” stated an expert. “A significant shipping incident in March and a spill of plastic pollution off the southern coast served as stark reminders. Conservation teams are working tirelessly to protect and restore our shorelines.”
Unprecedented encounters of a remarkably clever cephalopod this past summer have prompted the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters. A Confluence of Factors for a Population Boom A mild winter coupled with a remarkably hot spring prompted a huge population of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The reported landings was approximately thirteen times what we would typically see in the waters around Cornwall,” explained a marine conservation officer. “Calculating the figures, nearly a quarter of a million octopuses were present in UK waters this year – representing a massive jump from what is typical.” *Octopus vulgaris* is native to UK waters but usually so scarce it is rarely seen. A sudden increase is caused by the dual effect 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 noted in recent years. A Rare Phenomenon The most recent occasion, a population surge of this scale of this size was recorded in the mid-20th century, with historical records indicating the previous major event happened in 1900. The huge numbers of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Diver videos show octopuses congregating together – contrary to their normally lone nature – and ambulating along the seabed on the tips of their limbs. One individual was even recorded reaching for submarine recording equipment. “During a first dive off the Lizard peninsula this year I saw multiple octopuses,” they noted. “They are sizeable. We have two species in the region. One species is quite small, the size of a ball, but these newcomers can be with a span of 1.5 meters.” Future Prospects and Other Surprises If conditions remain mild heading into next year could lead to another surge next year, because based on records, in similar situations, 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 said. “Marine life is unpredictable at the moment so it’s hard to forecast.” The assessment also noted additional positive marine news around the UK coastline, including: A record number of gray seals seen in Cumbria. Exceptional populations of the iconic seabirds on Skomer. The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species. A variable blenny spotted off the coast of Sussex for the first time. A Note of Caution Challenges were also present, however. “The period was framed by environmental disasters,” stated an expert. “A significant shipping incident in March and a spill of plastic pollution off the southern coast served as stark reminders. Conservation teams are working tirelessly to protect and restore our shorelines.”