🔗 Share this article 2025 Declared 'The Octopus Year' Along Britain's South Coast. Exceptionally high observations of a remarkably clever cephalopod during the summer season have led to the naming of 2025 as the year for octopuses in a seasonal assessment of the nation's marine environment. A Perfect Storm Leading to an Explosion A gentle winter followed by an exceptionally warm spring catalyzed a huge population of Mediterranean octopuses to take up residence along England’s south coast, from Penzance in Cornwall to south Devon. “The volume of octopuses caught was roughly 13 times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were caught in these waters this year – that’s a huge increase from historical averages.” The Mediterranean octopus is indigenous to these waters but usually so scarce it is rarely seen. A sudden increase is caused by the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant increased juvenile survival, potentially supported by large numbers of spider crabs noted in recent years. A Historic Event The most recent occasion, a population surge of this scale of this size was observed in the mid-20th century, with past documentation indicating the one before that occurred in 1900. The sheer quantity of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Diver videos show octopuses congregating together – contrary to their normally lone nature – and moving along the ocean floor on their arm ends. One creature was even seen investigating submarine recording equipment. “On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. Two kinds exist in the region. The curled octopus is rather small, about the size of a football, but these common octopuses can be with a span of 1.5 meters.” Predictions and Marine Joy A second gentle winter going into 2026 suggests the potential a repeat event in 2026, because based on records, in similar situations, populations have surged again for two years in a row. “However, it is unlikely, based on past events, that it will go on for a long time,” they stated. “Marine life is unpredictable currently so it’s hard to forecast.” The report also noted additional positive marine news across British shores, including: Unprecedented numbers of grey seals recorded in Cumbria. Peak numbers of puffins on Skomer. The initial discovery of a rare sea slug in Yorkshire, usually found in the south-west. A type of blenny found off the coast of Sussex for the first time. A Note of Caution The year had its low points, however. “The period was framed by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Conservation teams are putting in immense work to protect and restore our coasts.”
Exceptionally high observations of a remarkably clever cephalopod during the summer season have led to the naming of 2025 as the year for octopuses in a seasonal assessment of the nation's marine environment. A Perfect Storm Leading to an Explosion A gentle winter followed by an exceptionally warm spring catalyzed a huge population of Mediterranean octopuses to take up residence along England’s south coast, from Penzance in Cornwall to south Devon. “The volume of octopuses caught was roughly 13 times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were caught in these waters this year – that’s a huge increase from historical averages.” The Mediterranean octopus is indigenous to these waters but usually so scarce it is rarely seen. A sudden increase is caused by the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant increased juvenile survival, potentially supported by large numbers of spider crabs noted in recent years. A Historic Event The most recent occasion, a population surge of this scale of this size was observed in the mid-20th century, with past documentation indicating the one before that occurred in 1900. The sheer quantity of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Diver videos show octopuses congregating together – contrary to their normally lone nature – and moving along the ocean floor on their arm ends. One creature was even seen investigating submarine recording equipment. “On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. Two kinds exist in the region. The curled octopus is rather small, about the size of a football, but these common octopuses can be with a span of 1.5 meters.” Predictions and Marine Joy A second gentle winter going into 2026 suggests the potential a repeat event in 2026, because based on records, in similar situations, populations have surged again for two years in a row. “However, it is unlikely, based on past events, that it will go on for a long time,” they stated. “Marine life is unpredictable currently so it’s hard to forecast.” The report also noted additional positive marine news across British shores, including: Unprecedented numbers of grey seals recorded in Cumbria. Peak numbers of puffins on Skomer. The initial discovery of a rare sea slug in Yorkshire, usually found in the south-west. A type of blenny found off the coast of Sussex for the first time. A Note of Caution The year had its low points, however. “The period was framed by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Conservation teams are putting in immense work to protect and restore our coasts.”