🔗 Share this article 2025 Proclaimed the 'Year of the Octopus' Off Britain's South Coast. Exceptionally high observations of a supremely intelligent sea creature during the summer season have prompted the declaration of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. Ideal Conditions Leading to an Explosion A gentle winter followed by a remarkably hot spring prompted a huge population of Mediterranean octopuses to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon. “The reported landings was roughly thirteen times what we would usually anticipate in Cornish waters,” commented a marine life specialist. “Calculating the figures, nearly a quarter of a million octopuses were present in these waters this year – representing a massive jump from historical averages.” The Mediterranean octopus is found in UK waters but usually so scarce it is rarely seen. An explosive growth is the result of a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by abundant stocks of a favored prey species also recorded. An Uncommon Occurrence The last time, an octopus bloom comparable was documented in the 1950s, with archival data indicating the one before that was in 1900. The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and ambulating along the seabed on their tentacle tips. One individual was even filmed grabbing a diver's camera. “The first time I dived in that area this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in the region. One species is rather small, football-sized, but these newcomers can be up to a metre and a half wide.” Future Prospects and Other Surprises Another mild winter going into 2026 meant it was possible a repeat event next year, because in the past, under these conditions, populations have surged again for two years running. “But, it's improbable, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises currently so it’s hard to forecast.” The assessment also noted additional positive marine news around the UK coastline, including: Highest-ever counts of grey seals observed in one northern region. Peak numbers of puffins on an island off Wales. The first recording of a rare sea slug in a northern county, usually found in the south-west. A type of blenny spotted off the coast of Sussex for the first occasion. Not All Positive News Not everything was good news, however. “The period was framed by ecological challenges,” said a head of marine conservation. “A significant shipping incident in March and the release of industrial pellets off the southern coast highlighted ongoing threats. Conservation teams are making huge efforts to protect and restore our shorelines.”
Exceptionally high observations of a supremely intelligent sea creature during the summer season have prompted the declaration of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. Ideal Conditions Leading to an Explosion A gentle winter followed by a remarkably hot spring prompted a huge population of Mediterranean octopuses to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon. “The reported landings was roughly thirteen times what we would usually anticipate in Cornish waters,” commented a marine life specialist. “Calculating the figures, nearly a quarter of a million octopuses were present in these waters this year – representing a massive jump from historical averages.” The Mediterranean octopus is found in UK waters but usually so scarce it is rarely seen. An explosive growth is the result of a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by abundant stocks of a favored prey species also recorded. An Uncommon Occurrence The last time, an octopus bloom comparable was documented in the 1950s, with archival data indicating the one before that was in 1900. The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and ambulating along the seabed on their tentacle tips. One individual was even filmed grabbing a diver's camera. “The first time I dived in that area this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in the region. One species is rather small, football-sized, but these newcomers can be up to a metre and a half wide.” Future Prospects and Other Surprises Another mild winter going into 2026 meant it was possible a repeat event next year, because in the past, under these conditions, populations have surged again for two years running. “But, it's improbable, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises currently so it’s hard to forecast.” The assessment also noted additional positive marine news around the UK coastline, including: Highest-ever counts of grey seals observed in one northern region. Peak numbers of puffins on an island off Wales. The first recording of a rare sea slug in a northern county, usually found in the south-west. A type of blenny spotted off the coast of Sussex for the first occasion. Not All Positive News Not everything was good news, however. “The period was framed by ecological challenges,” said a head of marine conservation. “A significant shipping incident in March and the release of industrial pellets off the southern coast highlighted ongoing threats. Conservation teams are making huge efforts to protect and restore our shorelines.”