2025 Declared 'The Octopus Year' Off England's South Coast.
Unprecedented sightings of one of the world's most intelligent invertebrates during the summer season have led to the designation of 2025 as “the year of the octopus” in a yearly report of UK coastal waters.
A Perfect Storm Driving a Surge
An unusually warm winter coupled with a very warm springtime catalyzed a huge population of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.
“The reported landings was approximately 13 times what we would typically see in Cornish waters,” commented an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were caught in British seas this year – which is a significant rise from what is typical.”
The Mediterranean octopus is indigenous to British seas but ordinarily in such small numbers it is infrequently encountered. An explosive growth is attributed to the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, maybe aided by significant populations of spider crabs also recorded.
An Uncommon Occurrence
Previously, a population surge of this scale of this size was recorded in the 1950s, with historical records indicating the last bloom prior to that was in 1900.
The remarkable abundance of octopuses meant they could be frequently seen in nearshore environments for the first time in recent history. Diver videos show octopuses being sociable – contrary to their normally lone nature – and ambulating along the bottom on their tentacle tips. A curious octopus was even seen investigating an underwater camera.
“On my initial dive there this year I saw multiple octopuses,” the officer added. “And these are big. Two kinds exist in the region. One species is smaller, about the size of a football, but these newcomers can be reaching impressive sizes.”
Looking Ahead & Coastal Highlights
Another mild winter going into 2026 could lead to a second bloom next year, because historically, in similar situations, the blooms have repeated for two years in a row.
“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises these days so it’s hard to forecast.”
The assessment also noted other “surprises, successes and joyful moments” across British shores, including:
- Highest-ever counts of gray seals observed in Cumbria.
- Record numbers of puffins on Skomer.
- The first recording of a rare sea slug in a northern county, normally residing farther south.
- A type of blenny spotted off the coast of a southern county for the first time.
Environmental Concerns
Challenges were also present, however. “The period was framed by marine incidents,” stated an expert. “A major tanker collision in March and an accidental discharge of plastic pollution off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to defend and heal our coasts.”
