🔗 Share this article 2025 Proclaimed The Year for Octopuses Off Britain's Southern Shores. Exceptionally high observations of one of the world's most intelligent invertebrates this past summer have prompted the naming of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment. A Perfect Storm for a Population Boom An unusually warm winter followed by an exceptionally warm spring triggered a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula. “The volume of octopuses caught was roughly over a dozen times what we would normally expect in this region,” commented a marine conservation officer. “Based on the totals, around 233 thousand octopuses were caught in UK waters this year – which is a significant rise from the norm.” The common octopus is indigenous to these waters but typically so rare it is rarely seen. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, potentially supported by significant populations of other marine life seen in the area. An Uncommon Occurrence The last time, such an octopus proliferation comparable was documented in 1950, with past documentation indicating the one before that occurred in 1900. The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and “walking” along the seabed on their tentacle tips. One creature was even seen investigating submarine recording equipment. “During a first dive in that area this year I saw multiple octopuses,” the officer added. “And these are big. There are two types in these waters. One species is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.” Predictions and Marine Joy A second gentle winter going into 2026 meant it was possible another surge the following year, because based on records, under these conditions, the blooms have repeated for two years in a row. “But, it's improbable, from previous blooms, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises currently so it’s hard to forecast.” The annual review also celebrated other “surprises, successes and joyful moments” around the UK coastline, including: Unprecedented numbers of grey seals observed in one northern region. Record numbers of the iconic seabirds on an island off Wales. The first recording of a rare sea slug in Yorkshire, normally residing farther south. A variable blenny spotted off the coast of a southern county for the first time. Not All Positive News The year had its low points, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of industrial pellets off the southern coast were serious issues. Conservation teams are working tirelessly to safeguard and rehabilitate our coasts.”
Exceptionally high observations of one of the world's most intelligent invertebrates this past summer have prompted the naming of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment. A Perfect Storm for a Population Boom An unusually warm winter followed by an exceptionally warm spring triggered a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula. “The volume of octopuses caught was roughly over a dozen times what we would normally expect in this region,” commented a marine conservation officer. “Based on the totals, around 233 thousand octopuses were caught in UK waters this year – which is a significant rise from the norm.” The common octopus is indigenous to these waters but typically so rare it is rarely seen. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, potentially supported by significant populations of other marine life seen in the area. An Uncommon Occurrence The last time, such an octopus proliferation comparable was documented in 1950, with past documentation indicating the one before that occurred in 1900. The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and “walking” along the seabed on their tentacle tips. One creature was even seen investigating submarine recording equipment. “During a first dive in that area this year I saw multiple octopuses,” the officer added. “And these are big. There are two types in these waters. One species is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.” Predictions and Marine Joy A second gentle winter going into 2026 meant it was possible another surge the following year, because based on records, under these conditions, the blooms have repeated for two years in a row. “But, it's improbable, from previous blooms, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises currently so it’s hard to forecast.” The annual review also celebrated other “surprises, successes and joyful moments” around the UK coastline, including: Unprecedented numbers of grey seals observed in one northern region. Record numbers of the iconic seabirds on an island off Wales. The first recording of a rare sea slug in Yorkshire, normally residing farther south. A variable blenny spotted off the coast of a southern county for the first time. Not All Positive News The year had its low points, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of industrial pellets off the southern coast were serious issues. Conservation teams are working tirelessly to safeguard and rehabilitate our coasts.”