🔗 Share this article 2025 Declared The Year for Octopuses Off Britain's Southern Shores. Record-breaking observations of one of the world's most intelligent invertebrates this past summer have led to the designation of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. A Perfect Storm for a Population Boom A mild winter followed by a very warm springtime catalyzed a huge population of *Octopus vulgaris* to settle along England’s south coast, spanning the Cornish and Devonian coasts. “The volume of octopuses caught was roughly over a dozen times what we would typically see in the waters around Cornwall,” stated an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were found in British seas this year – that’s a huge increase from the norm.” The Mediterranean octopus is indigenous to UK waters but typically so rare it is infrequently encountered. A population bloom is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs noted in recent years. A Rare Phenomenon The last time, such an octopus proliferation comparable was documented in the mid-20th century, with historical records indicating the last bloom prior to that occurred in 1900. The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One creature was even filmed grabbing a diver's camera. “On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are large specimens. Two kinds exist in the region. The curled octopus is quite small, football-sized, but these common octopuses can be reaching impressive sizes.” Looking Ahead & Coastal Highlights If conditions remain mild this coming winter could lead to a repeat event in 2026, because based on records, under these conditions, the blooms have repeated for two consecutive years. “Still, the chances are low, looking at history, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises currently so it’s hard to forecast.” The assessment also highlighted further encouraging coastal sightings along the coast, including: Highest-ever counts of grey seals seen in Cumbria. Peak numbers of puffins on an island off Wales. The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species. A type of blenny discovered off the coast of Sussex for the first time. Not All Positive News Challenges were also present, however. “The calendar year was marked by ecological challenges,” stated an expert. “A major tanker collision in March and a spill of industrial pellets off the Sussex coast served as stark reminders. Dedicated individuals are putting in immense work to safeguard and rehabilitate our marine habitats.”
Record-breaking observations of one of the world's most intelligent invertebrates this past summer have led to the designation of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. A Perfect Storm for a Population Boom A mild winter followed by a very warm springtime catalyzed a huge population of *Octopus vulgaris* to settle along England’s south coast, spanning the Cornish and Devonian coasts. “The volume of octopuses caught was roughly over a dozen times what we would typically see in the waters around Cornwall,” stated an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were found in British seas this year – that’s a huge increase from the norm.” The Mediterranean octopus is indigenous to UK waters but typically so rare it is infrequently encountered. A population bloom is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs noted in recent years. A Rare Phenomenon The last time, such an octopus proliferation comparable was documented in the mid-20th century, with historical records indicating the last bloom prior to that occurred in 1900. The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One creature was even filmed grabbing a diver's camera. “On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are large specimens. Two kinds exist in the region. The curled octopus is quite small, football-sized, but these common octopuses can be reaching impressive sizes.” Looking Ahead & Coastal Highlights If conditions remain mild this coming winter could lead to a repeat event in 2026, because based on records, under these conditions, the blooms have repeated for two consecutive years. “Still, the chances are low, looking at history, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises currently so it’s hard to forecast.” The assessment also highlighted further encouraging coastal sightings along the coast, including: Highest-ever counts of grey seals seen in Cumbria. Peak numbers of puffins on an island off Wales. The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species. A type of blenny discovered off the coast of Sussex for the first time. Not All Positive News Challenges were also present, however. “The calendar year was marked by ecological challenges,” stated an expert. “A major tanker collision in March and a spill of industrial pellets off the Sussex coast served as stark reminders. Dedicated individuals are putting in immense work to safeguard and rehabilitate our marine habitats.”