🔗 Share this article 2025 Declared 'The Octopus Year' Off Britain's South Coast. Unprecedented encounters of a supremely intelligent sea creature this past summer have prompted 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 mild winter coupled with a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along England’s south coast, across the southwestern peninsula. “The scale of the catch was of the order of about 13 times what we would usually anticipate in the waters around Cornwall,” commented an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were caught in British seas this year – that’s a huge increase from historical averages.” *Octopus vulgaris* is found in these waters but usually so scarce it is rarely seen. A population bloom is attributed to a combination of gentle winter conditions and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by abundant stocks of a favored prey species seen in the area. A Historic Event Previously, a population surge of this scale this significant was documented in the mid-20th century, with past documentation indicating the one before that happened in 1900. The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in recent history. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the bottom on their arm ends. A curious octopus was even filmed grabbing a diver's camera. “During a first dive in that area this year I saw five of these creatures,” the specialist continued. “And these are big. There are two types in UK waters. One species is quite small, football-sized, but these common octopuses can be up to a metre and a half wide.” Predictions and Marine Joy A second gentle winter going into 2026 could lead to a second bloom in 2026, because historically, with such patterns, populations have surged again for two years running. “But, it's improbable, looking at history, that it will go on for a long time,” they said. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.” The annual review also noted other “surprises, successes and joyful moments” across British shores, including: A record number of grey seals observed in Cumbria. Peak numbers of puffins on Skomer. The first recording of a rare sea slug in Yorkshire, usually found in the south-west. A variable blenny spotted off the coast of a southern county for the inaugural time. Environmental Concerns Not everything was good news, however. “The period was framed by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and a spill of tonnes of plastic biobeads off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to protect and restore our marine habitats.”
Unprecedented encounters of a supremely intelligent sea creature this past summer have prompted 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 mild winter coupled with a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along England’s south coast, across the southwestern peninsula. “The scale of the catch was of the order of about 13 times what we would usually anticipate in the waters around Cornwall,” commented an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were caught in British seas this year – that’s a huge increase from historical averages.” *Octopus vulgaris* is found in these waters but usually so scarce it is rarely seen. A population bloom is attributed to a combination of gentle winter conditions and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by abundant stocks of a favored prey species seen in the area. A Historic Event Previously, a population surge of this scale this significant was documented in the mid-20th century, with past documentation indicating the one before that happened in 1900. The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in recent history. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the bottom on their arm ends. A curious octopus was even filmed grabbing a diver's camera. “During a first dive in that area this year I saw five of these creatures,” the specialist continued. “And these are big. There are two types in UK waters. One species is quite small, football-sized, but these common octopuses can be up to a metre and a half wide.” Predictions and Marine Joy A second gentle winter going into 2026 could lead to a second bloom in 2026, because historically, with such patterns, populations have surged again for two years running. “But, it's improbable, looking at history, that it will go on for a long time,” they said. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.” The annual review also noted other “surprises, successes and joyful moments” across British shores, including: A record number of grey seals observed in Cumbria. Peak numbers of puffins on Skomer. The first recording of a rare sea slug in Yorkshire, usually found in the south-west. A variable blenny spotted off the coast of a southern county for the inaugural time. Environmental Concerns Not everything was good news, however. “The period was framed by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and a spill of tonnes of plastic biobeads off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to protect and restore our marine habitats.”