🔗 Share this article 2025 Declared 'The Octopus Year' Off England's Southern Shores. Unprecedented observations of a supremely intelligent sea creature this past summer have resulted in the naming of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. A Confluence of Factors for a Population Boom A gentle winter followed by an exceptionally warm spring prompted a massive influx of Mediterranean octopuses to settle along the southern coastline of England, spanning the Cornish and Devonian coasts. “The reported landings was roughly 13 times what we would normally expect in this region,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were found in British seas this year – which is a significant rise from the norm.” *Octopus vulgaris* is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A population bloom is attributed to the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by large numbers of other marine life noted in recent years. A Rare Phenomenon Previously, an octopus bloom of this size was recorded in 1950, with historical records indicating the previous major event occurred in 1900. The remarkable abundance of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and moving along the bottom on their arm ends. A curious octopus was even recorded reaching for submarine recording equipment. “On my initial dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “They are sizeable. There are two types in UK waters. The curled octopus is rather small, about the size of a football, but these common octopuses can be reaching impressive sizes.” Predictions and Marine Joy If conditions remain mild going into 2026 could lead to a second bloom next year, because in the past, with such patterns, events have occurred consecutively for two consecutive years. “But, it's improbable, from previous blooms, that it will become a permanent fixture,” they said. “The ocean is full of surprises currently so it’s a very uncertain scenario.” The report also celebrated additional positive marine news around the UK coastline, including: Highest-ever counts of gray seals observed in one northern region. Peak numbers of the iconic seabirds on Skomer. A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south. A type of blenny spotted off the coast of a southern county for the first occasion. Not All Positive News Not everything was good news, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and a spill of industrial pellets off the Sussex coast were serious issues. Dedicated individuals are working tirelessly to safeguard and rehabilitate our shorelines.”
Unprecedented observations of a supremely intelligent sea creature this past summer have resulted in the naming of 2025 as the year for octopuses in a seasonal assessment of Britain’s seas. A Confluence of Factors for a Population Boom A gentle winter followed by an exceptionally warm spring prompted a massive influx of Mediterranean octopuses to settle along the southern coastline of England, spanning the Cornish and Devonian coasts. “The reported landings was roughly 13 times what we would normally expect in this region,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were found in British seas this year – which is a significant rise from the norm.” *Octopus vulgaris* is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A population bloom is attributed to the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by large numbers of other marine life noted in recent years. A Rare Phenomenon Previously, an octopus bloom of this size was recorded in 1950, with historical records indicating the previous major event occurred in 1900. The remarkable abundance of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and moving along the bottom on their arm ends. A curious octopus was even recorded reaching for submarine recording equipment. “On my initial dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “They are sizeable. There are two types in UK waters. The curled octopus is rather small, about the size of a football, but these common octopuses can be reaching impressive sizes.” Predictions and Marine Joy If conditions remain mild going into 2026 could lead to a second bloom next year, because in the past, with such patterns, events have occurred consecutively for two consecutive years. “But, it's improbable, from previous blooms, that it will become a permanent fixture,” they said. “The ocean is full of surprises currently so it’s a very uncertain scenario.” The report also celebrated additional positive marine news around the UK coastline, including: Highest-ever counts of gray seals observed in one northern region. Peak numbers of the iconic seabirds on Skomer. A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south. A type of blenny spotted off the coast of a southern county for the first occasion. Not All Positive News Not everything was good news, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and a spill of industrial pellets off the Sussex coast were serious issues. Dedicated individuals are working tirelessly to safeguard and rehabilitate our shorelines.”