🔗 Share this article 2025 Hailed as The Year for Octopuses Off Britain's South Coast. Exceptionally high encounters of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as “the year of the octopus” in an annual review of the nation's marine environment. A Perfect Storm Leading to an Explosion A mild winter followed by a remarkably hot spring catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The scale of the catch was roughly 13 times what we would normally expect in Cornish waters,” stated an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were caught in these waters this year – representing a massive jump from what is typical.” The common octopus is native to British seas but usually so scarce it is seldom observed. A sudden increase is attributed to a combination of gentle winter conditions and a warm breeding season. These ideal conditions meant more larvae, potentially supported by abundant stocks of spider crabs seen in the area. A Historic Event Previously, a population surge of this scale of this size was documented in 1950, with past documentation indicating the previous major event happened in 1900. The remarkable abundance of octopuses meant they could be easily spotted 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. One creature was even filmed grabbing a diver's camera. “The first time I dived there this year I saw five octopuses,” the officer added. “They are large specimens. We have two species in the region. The curled octopus is quite small, the size of a ball, but these newcomers can be up to a metre and a half wide.” Looking Ahead & Coastal Highlights Another mild winter going into 2026 could lead to a repeat event in 2026, because in the past, in similar situations, events have occurred consecutively for two years in a row. “However, it is unlikely, from previous blooms, that it will go on for a long time,” they said. “Marine life is unpredictable these days so it’s a very uncertain scenario.” The annual review also noted additional positive marine news along the coast, including: Unprecedented numbers of gray seals observed in Cumbria. Exceptional populations of puffins on a Welsh island. The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species. A Mediterranean fish species found off the coast of Sussex for the inaugural time. Not All Positive News Challenges were also present, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Conservation teams are putting in immense work to defend and heal our marine habitats.”
Exceptionally high encounters of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as “the year of the octopus” in an annual review of the nation's marine environment. A Perfect Storm Leading to an Explosion A mild winter followed by a remarkably hot spring catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts. “The scale of the catch was roughly 13 times what we would normally expect in Cornish waters,” stated an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were caught in these waters this year – representing a massive jump from what is typical.” The common octopus is native to British seas but usually so scarce it is seldom observed. A sudden increase is attributed to a combination of gentle winter conditions and a warm breeding season. These ideal conditions meant more larvae, potentially supported by abundant stocks of spider crabs seen in the area. A Historic Event Previously, a population surge of this scale of this size was documented in 1950, with past documentation indicating the previous major event happened in 1900. The remarkable abundance of octopuses meant they could be easily spotted 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. One creature was even filmed grabbing a diver's camera. “The first time I dived there this year I saw five octopuses,” the officer added. “They are large specimens. We have two species in the region. The curled octopus is quite small, the size of a ball, but these newcomers can be up to a metre and a half wide.” Looking Ahead & Coastal Highlights Another mild winter going into 2026 could lead to a repeat event in 2026, because in the past, in similar situations, events have occurred consecutively for two years in a row. “However, it is unlikely, from previous blooms, that it will go on for a long time,” they said. “Marine life is unpredictable these days so it’s a very uncertain scenario.” The annual review also noted additional positive marine news along the coast, including: Unprecedented numbers of gray seals observed in Cumbria. Exceptional populations of puffins on a Welsh island. The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species. A Mediterranean fish species found off the coast of Sussex for the inaugural time. Not All Positive News Challenges were also present, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Conservation teams are putting in immense work to defend and heal our marine habitats.”