2025 Declared 'The Octopus Year' Along Britain's Southern Shores.
Record-breaking encounters of a supremely intelligent sea creature over the summer months have led to the naming of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.
A Confluence of Factors Driving a Surge
An unusually warm winter and then a very warm springtime prompted a huge population of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The reported landings was of the order of about thirteen times what we would normally expect in Cornish waters,” commented a marine conservation officer. “Based on the totals, around 233 thousand octopuses were present in these waters this year – which is a significant rise from historical averages.”
*Octopus vulgaris* is indigenous to UK waters but usually so scarce it is seldom observed. An explosive growth is the result of the dual effect of a mild winter and a warm breeding season. This perfect scenario meant increased juvenile survival, potentially supported by large numbers of spider crabs also recorded.
An Uncommon Occurrence
The most recent occasion, an octopus bloom comparable was recorded in the mid-20th century, with archival data indicating the one before that occurred in the turn of the 20th century.
The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the bottom on the tips of their limbs. One individual was even seen investigating submarine recording equipment.
“On my initial dive there this year I saw multiple octopuses,” the officer added. “They are large specimens. There are two types in these waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”
Predictions and Marine Joy
If conditions remain mild heading into next year meant it was possible a repeat event in 2026, because in the past, in similar situations, populations have surged again for two years running.
“But, it's improbable, looking at history, that it will go on for a long time,” they stated. “The ocean is full of surprises currently so it’s a very uncertain scenario.”
The annual review also noted other “surprises, successes and joyful moments” along the coast, including:
- Highest-ever counts of grey seals seen in one northern region.
- Record numbers of the iconic seabirds on Skomer.
- A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
- A Mediterranean fish species discovered off the coast of Sussex for the first occasion.
Environmental Concerns
Challenges were also present, however. “The calendar year was marked by ecological challenges,” 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. Conservation teams are working tirelessly to defend and heal our coasts.”
