2025 Declared The Year for Octopuses Off Britain's South Coast.
Record-breaking observations of a supremely intelligent sea creature during the summer season have resulted in the naming of 2025 as the year for octopuses in an annual review of Britain’s seas.
A Confluence of Factors for a Population Boom
A gentle winter coupled with a very warm springtime prompted 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 scale of the catch was roughly thirteen times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were present in these waters this year – representing a massive jump from historical averages.”
*Octopus vulgaris* is indigenous to UK waters but usually so scarce it is rarely seen. A sudden increase is the result of the dual effect of a mild winter and a warm breeding season. These ideal conditions meant more larvae, potentially supported by abundant stocks of a favored prey species seen in the area.
An Uncommon Occurrence
The last time, a population surge of this scale of this size was recorded in the 1950s, with historical records indicating the last bloom prior to that happened in the turn of the 20th century.
The huge numbers of octopuses meant they could be frequently seen in nearshore environments for the first time in recent history. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and ambulating along the ocean floor on their arm ends. One creature was even recorded reaching for submarine recording equipment.
“On my initial dive in that area this year I saw five octopuses,” they noted. “They are large specimens. We have two species in the region. The curled octopus is quite small, about the size of a football, but the *Octopus vulgaris* can be with a span of 1.5 meters.”
Looking Ahead & Coastal Highlights
Another mild winter going into 2026 meant it was possible a repeat event next year, because in the past, with such patterns, the blooms have repeated for two years running.
“Still, the chances are low, looking at history, that it will become a permanent fixture,” they said. “The ocean is full of surprises these days so it’s quite an unpredictable situation.”
The annual review also noted additional positive marine news across British shores, including:
- Highest-ever counts of gray seals observed in Cumbria.
- Exceptional populations of puffins on Skomer.
- The initial discovery of an unusual mollusc in a northern county, typically a southwestern species.
- A type of blenny spotted off the coast of a southern county for the first occasion.
Environmental Concerns
The year had its low points, however. “The calendar year was marked by environmental disasters,” said a head of marine conservation. “A significant shipping incident in the North Sea and an accidental discharge of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Staff and volunteers are making huge efforts to safeguard and rehabilitate our marine habitats.”
