🔗 Share this article 2025 Hailed as 'The Octopus Year' Off Britain's Southern Shores. Exceptionally high encounters of one of the world's most intelligent invertebrates during the summer season have resulted in the designation of 2025 as the year for octopuses in a yearly report of UK coastal waters. A Confluence of Factors Leading to an Explosion A gentle winter followed by a remarkably hot spring prompted a massive influx of Mediterranean octopuses to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The reported landings was roughly over a dozen times what we would typically see in this region,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were caught in British seas this year – representing a massive jump from what is typical.” *Octopus vulgaris* is native to UK waters but typically so rare it is seldom observed. A sudden increase is caused by the dual effect of a mild winter and a warm breeding season. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by significant populations of other marine life seen in the area. A Historic Event The last time, an octopus bloom this significant was observed in the mid-20th century, with archival data indicating the last bloom prior to that was in 1900. The huge numbers of octopuses meant they could be frequently seen in coastal areas for the first time in recent history. Underwater recordings show octopuses congregating together – they are usually solitary – and ambulating along the ocean floor on their tentacle tips. One individual was even filmed grabbing submarine recording equipment. “During a first dive in that area this year I saw five of these creatures,” the officer added. “And these are big. We have two species in UK waters. One species is rather small, about the size of a football, but these common octopuses can be up to a metre and a half wide.” Looking Ahead & Coastal Highlights If conditions remain mild heading into next year suggests the potential a repeat event in 2026, because historically, in similar situations, populations have surged again for two years in a row. “However, it is unlikely, based on past events, that it will become a permanent fixture,” they cautioned. “The ocean is full of surprises these days so it’s quite an unpredictable situation.” The assessment also celebrated other “surprises, successes and joyful moments” around the UK coastline, including: A record number of gray seals observed in Cumbria. Peak numbers of the iconic seabirds on Skomer. The first recording of an unusual mollusc in a northern county, normally residing farther south. A Mediterranean fish species found 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 ecological challenges,” noted a conservation leader. “A major tanker collision in March and the release of industrial pellets off the Sussex coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our shorelines.”
Exceptionally high encounters of one of the world's most intelligent invertebrates during the summer season have resulted in the designation of 2025 as the year for octopuses in a yearly report of UK coastal waters. A Confluence of Factors Leading to an Explosion A gentle winter followed by a remarkably hot spring prompted a massive influx of Mediterranean octopuses to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The reported landings was roughly over a dozen times what we would typically see in this region,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were caught in British seas this year – representing a massive jump from what is typical.” *Octopus vulgaris* is native to UK waters but typically so rare it is seldom observed. A sudden increase is caused by the dual effect of a mild winter and a warm breeding season. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by significant populations of other marine life seen in the area. A Historic Event The last time, an octopus bloom this significant was observed in the mid-20th century, with archival data indicating the last bloom prior to that was in 1900. The huge numbers of octopuses meant they could be frequently seen in coastal areas for the first time in recent history. Underwater recordings show octopuses congregating together – they are usually solitary – and ambulating along the ocean floor on their tentacle tips. One individual was even filmed grabbing submarine recording equipment. “During a first dive in that area this year I saw five of these creatures,” the officer added. “And these are big. We have two species in UK waters. One species is rather small, about the size of a football, but these common octopuses can be up to a metre and a half wide.” Looking Ahead & Coastal Highlights If conditions remain mild heading into next year suggests the potential a repeat event in 2026, because historically, in similar situations, populations have surged again for two years in a row. “However, it is unlikely, based on past events, that it will become a permanent fixture,” they cautioned. “The ocean is full of surprises these days so it’s quite an unpredictable situation.” The assessment also celebrated other “surprises, successes and joyful moments” around the UK coastline, including: A record number of gray seals observed in Cumbria. Peak numbers of the iconic seabirds on Skomer. The first recording of an unusual mollusc in a northern county, normally residing farther south. A Mediterranean fish species found 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 ecological challenges,” noted a conservation leader. “A major tanker collision in March and the release of industrial pellets off the Sussex coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our shorelines.”