2025 Declared 'The Octopus Year' Off England's South Coast.
Record-breaking encounters of a remarkably clever cephalopod this past summer have led to the declaration of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.
A Perfect Storm Driving a Surge
A mild winter coupled with a remarkably hot spring prompted a huge population of Mediterranean octopuses to establish themselves along England’s south coast, spanning the Cornish and Devonian coasts.
“The reported landings was roughly 13 times what we would normally expect in Cornish waters,” stated a marine life specialist. “Calculating the figures, nearly a quarter of a million octopuses were found in British seas this year – which is a significant rise from the norm.”
The common octopus is found in British seas but usually so scarce it is infrequently encountered. A population bloom is attributed to a combination of gentle winter conditions and favorable spring temperatures. These ideal conditions meant increased juvenile survival, maybe aided by abundant stocks of spider crabs also recorded.
A Historic Event
The most recent occasion, a population surge of this scale of this size was observed in the 1950s, with historical records indicating the last bloom prior to that occurred in the turn of the 20th century.
The sheer quantity of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Diver videos show octopuses gathering in groups – unlike their typical solitary behavior – and moving along the seabed on the tips of their limbs. A curious octopus was even recorded reaching for a diver's camera.
“On my initial dive there this year I saw five octopuses,” the specialist continued. “They are sizeable. Two kinds exist in the region. One species is smaller, football-sized, but these newcomers can be with a span of 1.5 meters.”
Future Prospects and Other Surprises
Another mild winter going into 2026 meant it was possible a second bloom next year, because based on records, in similar situations, events have occurred consecutively for two consecutive years.
“However, it is unlikely, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises these days so it’s hard to forecast.”
The assessment also noted further encouraging coastal sightings around the UK coastline, including:
- A record number of gray seals recorded in one northern region.
- Record numbers of the iconic seabirds on Skomer.
- The first recording of an unusual mollusc in a northern county, typically a southwestern species.
- A type of blenny found off the coast of Sussex for the inaugural time.
Environmental Concerns
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 Sussex coast highlighted ongoing threats. Staff and volunteers are working tirelessly to protect and restore our shorelines.”
