🔗 Share this article 2025 Hailed as The Year for Octopuses Off Britain's Southern Shores. Unprecedented observations of a remarkably clever cephalopod during the summer season have prompted the designation of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. Ideal Conditions Driving a Surge A mild winter followed by an exceptionally warm spring triggered a huge population of *Octopus vulgaris* to settle along the southern coastline of England, spanning the Cornish and Devonian coasts. “The scale of the catch was approximately over a dozen times what we would typically see in Cornish waters,” stated a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were found in British seas this year – representing a massive jump from the norm.” *Octopus vulgaris* is native to UK waters but ordinarily in such small numbers it is rarely seen. A population bloom is attributed to a combination of a mild winter and a warm breeding season. These ideal conditions meant more larvae, possibly in part fuelled by abundant stocks of a favored prey species noted in recent years. A Rare Phenomenon The last time, an octopus bloom of this size was observed in 1950, with archival data indicating the previous major event occurred in the turn of the 20th century. The huge numbers of octopuses meant they could be readily observed in coastal areas for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and moving along the seabed on the tips of their limbs. A curious octopus was even filmed grabbing a diver's camera. “During a first dive there this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in these waters. One species is smaller, football-sized, but these common octopuses can be with a span of 1.5 meters.” Future Prospects and Other Surprises Another mild winter this coming winter suggests the potential a repeat event next year, because based on records, under these conditions, the blooms have repeated for two years in a row. “However, it is unlikely, based on past events, that it will become a permanent fixture,” they said. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.” The report also highlighted other “surprises, successes and joyful moments” along the coast, including: Highest-ever counts of gray seals seen in Cumbria. Exceptional populations of puffins on an island off Wales. The first recording 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 occasion. A Note of Caution The year had its low points, however. “The calendar year was marked by marine incidents,” said a head of marine conservation. “A significant shipping incident in the North Sea and the release of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are making huge efforts to protect and restore our marine habitats.”
Unprecedented observations of a remarkably clever cephalopod during the summer season have prompted the designation of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. Ideal Conditions Driving a Surge A mild winter followed by an exceptionally warm spring triggered a huge population of *Octopus vulgaris* to settle along the southern coastline of England, spanning the Cornish and Devonian coasts. “The scale of the catch was approximately over a dozen times what we would typically see in Cornish waters,” stated a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were found in British seas this year – representing a massive jump from the norm.” *Octopus vulgaris* is native to UK waters but ordinarily in such small numbers it is rarely seen. A population bloom is attributed to a combination of a mild winter and a warm breeding season. These ideal conditions meant more larvae, possibly in part fuelled by abundant stocks of a favored prey species noted in recent years. A Rare Phenomenon The last time, an octopus bloom of this size was observed in 1950, with archival data indicating the previous major event occurred in the turn of the 20th century. The huge numbers of octopuses meant they could be readily observed in coastal areas for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and moving along the seabed on the tips of their limbs. A curious octopus was even filmed grabbing a diver's camera. “During a first dive there this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in these waters. One species is smaller, football-sized, but these common octopuses can be with a span of 1.5 meters.” Future Prospects and Other Surprises Another mild winter this coming winter suggests the potential a repeat event next year, because based on records, under these conditions, the blooms have repeated for two years in a row. “However, it is unlikely, based on past events, that it will become a permanent fixture,” they said. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.” The report also highlighted other “surprises, successes and joyful moments” along the coast, including: Highest-ever counts of gray seals seen in Cumbria. Exceptional populations of puffins on an island off Wales. The first recording 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 occasion. A Note of Caution The year had its low points, however. “The calendar year was marked by marine incidents,” said a head of marine conservation. “A significant shipping incident in the North Sea and the release of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are making huge efforts to protect and restore our marine habitats.”