2025 Declared 'The Octopus Year' Off England's Southern Shores.
Exceptionally high encounters of a supremely intelligent sea creature this past summer have prompted the naming of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.
A Perfect Storm for a Population Boom
A gentle winter coupled with an exceptionally warm spring prompted unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The scale of the catch was of the order of about 13 times what we would normally expect in Cornish waters,” stated a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were caught in British seas this year – that’s a huge increase from what is typical.”
*Octopus vulgaris* is indigenous to British seas but typically so rare it is seldom observed. An explosive growth is attributed to the dual effect of gentle winter conditions and a warm breeding season. Such favorable circumstances meant increased juvenile survival, maybe aided by significant populations of spider crabs also recorded.
An Uncommon Occurrence
The most recent occasion, an octopus bloom comparable was documented in the mid-20th century, with archival data indicating the one before that occurred in 1900.
The huge numbers of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Diver videos show octopuses gathering in groups – they are usually solitary – and moving along the ocean floor on their arm ends. A curious octopus was even seen investigating an underwater camera.
“The first time I dived off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “And these are big. We have two species in these waters. The curled octopus is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”
Predictions and Marine Joy
A second gentle winter going into 2026 suggests the potential a second bloom next year, because historically, under these conditions, the blooms have repeated for two years in a row.
“But, it's improbable, based on past events, that it will go on for a long time,” they cautioned. “But the sea keeps giving us surprises currently so it’s quite an unpredictable situation.”
The annual review also noted additional positive marine news around the UK coastline, including:
- Unprecedented numbers of gray seals seen in Cumbria.
- Exceptional populations of the iconic seabirds on a Welsh island.
- The initial discovery of an unusual mollusc in a northern county, normally residing farther south.
- A variable blenny found off the coast of a southern county for the inaugural time.
A Note of Caution
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 the release of plastic pollution off the Sussex coast were serious issues. Dedicated individuals are working tirelessly to safeguard and rehabilitate our shorelines.”
