🔗 Share this article 2025 Hailed as 'The Octopus Year' Off England's South Coast. Exceptionally high observations of a supremely intelligent sea creature this past summer have resulted in the declaration of 2025 as the year for octopuses in an annual review of the nation's marine environment. A Perfect Storm Leading to an Explosion A mild winter coupled with a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon. “The reported landings was approximately thirteen times what we would normally expect in the waters around Cornwall,” stated a marine conservation officer. “When we added up the numbers, approximately 233,000 octopuses were caught in British seas this year – representing a massive jump from historical averages.” The common octopus is indigenous to these waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by significant populations of spider crabs also recorded. An Uncommon Occurrence Previously, an octopus bloom this significant was recorded in the mid-20th century, with archival data indicating the one before that occurred in 1900. The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even seen investigating an underwater camera. “During a first dive in that area this year I saw five of these creatures,” they noted. “And these are big. There are two types in the region. The curled octopus is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.” Future Prospects and Other Surprises A second gentle winter this coming winter could lead to another surge next year, because historically, in similar situations, the blooms have repeated for two years in a row. “But, it's improbable, looking at history, that it will persist indefinitely,” they said. “Marine life is unpredictable currently so it’s a very uncertain scenario.” The annual review also noted further encouraging coastal sightings across British shores, including: Unprecedented numbers of grey seals recorded in one northern region. Exceptional populations of the iconic seabirds on Skomer. The initial discovery of an unusual mollusc in a northern county, typically a southwestern species. A Mediterranean fish species spotted off the coast of a southern county for the first time. A Note of Caution Challenges were also present, 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 served as stark reminders. Dedicated individuals are making huge efforts to protect and restore our marine habitats.”
Exceptionally high observations of a supremely intelligent sea creature this past summer have resulted in the declaration of 2025 as the year for octopuses in an annual review of the nation's marine environment. A Perfect Storm Leading to an Explosion A mild winter coupled with a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon. “The reported landings was approximately thirteen times what we would normally expect in the waters around Cornwall,” stated a marine conservation officer. “When we added up the numbers, approximately 233,000 octopuses were caught in British seas this year – representing a massive jump from historical averages.” The common octopus is indigenous to these waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by significant populations of spider crabs also recorded. An Uncommon Occurrence Previously, an octopus bloom this significant was recorded in the mid-20th century, with archival data indicating the one before that occurred in 1900. The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even seen investigating an underwater camera. “During a first dive in that area this year I saw five of these creatures,” they noted. “And these are big. There are two types in the region. The curled octopus is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.” Future Prospects and Other Surprises A second gentle winter this coming winter could lead to another surge next year, because historically, in similar situations, the blooms have repeated for two years in a row. “But, it's improbable, looking at history, that it will persist indefinitely,” they said. “Marine life is unpredictable currently so it’s a very uncertain scenario.” The annual review also noted further encouraging coastal sightings across British shores, including: Unprecedented numbers of grey seals recorded in one northern region. Exceptional populations of the iconic seabirds on Skomer. The initial discovery of an unusual mollusc in a northern county, typically a southwestern species. A Mediterranean fish species spotted off the coast of a southern county for the first time. A Note of Caution Challenges were also present, 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 served as stark reminders. Dedicated individuals are making huge efforts to protect and restore our marine habitats.”