2025 Proclaimed The Year for Octopuses Along England's South Coast.
Record-breaking sightings of a remarkably clever cephalopod over the summer months have led to the naming of 2025 as the year for octopuses in an annual review of the nation's marine environment.
A Perfect Storm for a Population Boom
A mild winter coupled with a remarkably hot spring prompted a huge population of Mediterranean octopuses to settle along England’s south coast, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was approximately over a dozen times what we would usually anticipate in this region,” commented an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were caught in these waters this year – that’s a huge increase from the norm.”
The common octopus is found in British seas but typically so rare it is seldom observed. An explosive growth is the result of the dual effect of a mild winter and a warm breeding season. These ideal conditions meant increased juvenile survival, maybe aided by abundant stocks of other marine life also recorded.
A Historic Event
Previously, such an octopus proliferation comparable was recorded in the mid-20th century, with historical records indicating the last bloom prior to that happened in 1900.
The remarkable abundance of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Diver videos show octopuses gathering in groups – they are usually solitary – and moving along the ocean floor on the tips of their limbs. A curious octopus was even seen investigating a diver's camera.
“During a first dive in that area this year I saw five of these creatures,” the specialist continued. “And these are big. We have two species in UK waters. The curled octopus is smaller, the size of a ball, but these common octopuses can be reaching impressive sizes.”
Future Prospects and Other Surprises
Another mild winter heading into next year could lead to a repeat event in 2026, because in the past, in similar situations, the blooms have repeated for two years in a row.
“However, it is unlikely, from previous blooms, that it will become a permanent fixture,” they said. “Marine life is unpredictable currently so it’s quite an unpredictable situation.”
The assessment also noted further encouraging coastal sightings along the coast, including:
- Unprecedented numbers of grey seals observed in Cumbria.
- Exceptional populations of the iconic seabirds on an island off Wales.
- A first-ever sighting of a rare sea slug in a northern county, usually found in the south-west.
- A variable blenny discovered off the coast of a southern county for the first time.
A Note of Caution
The year had its low points, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and the release of tonnes of plastic biobeads off the southern coast served as stark reminders. Staff and volunteers are working tirelessly to defend and heal our marine habitats.”
