🔗 Share this article 2025 Declared the 'Year of the Octopus' Off England's South Coast. Unprecedented observations 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 the nation's marine environment. Ideal Conditions Leading to an Explosion A mild winter followed by an exceptionally warm spring catalyzed unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence 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 normally expect in the waters around Cornwall,” explained an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were present in British seas this year – representing a massive jump from the norm.” The common octopus is native to these waters but typically so rare it is rarely seen. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, maybe aided by significant populations of other marine life seen in the area. A Rare Phenomenon The last time, an octopus bloom of this size was recorded in the 1950s, with past documentation indicating the previous major event was in the turn of the 20th century. The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Diver videos show octopuses gathering in groups – they are usually solitary – and “walking” along the ocean floor on their arm ends. One individual was even seen investigating a diver's camera. “The first time I dived in that area this year I saw multiple octopuses,” they noted. “They are large specimens. We have two species in UK waters. The curled octopus is rather small, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.” Future Prospects and Other Surprises If conditions remain mild going into 2026 suggests the potential a repeat event in 2026, because in the past, with such patterns, events have occurred consecutively for two years in a row. “But, it's improbable, from previous blooms, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.” The annual review also highlighted further encouraging coastal sightings across British shores, including: Unprecedented numbers of gray seals recorded in one northern region. Peak numbers of puffins on an island off Wales. The first recording of an unusual mollusc in Yorkshire, usually found in the south-west. A type of blenny discovered off the coast of Sussex for the first occasion. A Note of Caution Challenges were also present, however. “The year was bookended by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and an accidental discharge of tonnes of plastic biobeads off the southern coast served as stark reminders. Conservation teams are making huge efforts to defend and heal our shorelines.”
Unprecedented observations 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 the nation's marine environment. Ideal Conditions Leading to an Explosion A mild winter followed by an exceptionally warm spring catalyzed unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence 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 normally expect in the waters around Cornwall,” explained an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were present in British seas this year – representing a massive jump from the norm.” The common octopus is native to these waters but typically so rare it is rarely seen. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, maybe aided by significant populations of other marine life seen in the area. A Rare Phenomenon The last time, an octopus bloom of this size was recorded in the 1950s, with past documentation indicating the previous major event was in the turn of the 20th century. The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Diver videos show octopuses gathering in groups – they are usually solitary – and “walking” along the ocean floor on their arm ends. One individual was even seen investigating a diver's camera. “The first time I dived in that area this year I saw multiple octopuses,” they noted. “They are large specimens. We have two species in UK waters. The curled octopus is rather small, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.” Future Prospects and Other Surprises If conditions remain mild going into 2026 suggests the potential a repeat event in 2026, because in the past, with such patterns, events have occurred consecutively for two years in a row. “But, it's improbable, from previous blooms, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.” The annual review also highlighted further encouraging coastal sightings across British shores, including: Unprecedented numbers of gray seals recorded in one northern region. Peak numbers of puffins on an island off Wales. The first recording of an unusual mollusc in Yorkshire, usually found in the south-west. A type of blenny discovered off the coast of Sussex for the first occasion. A Note of Caution Challenges were also present, however. “The year was bookended by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and an accidental discharge of tonnes of plastic biobeads off the southern coast served as stark reminders. Conservation teams are making huge efforts to defend and heal our shorelines.”