2025 Proclaimed the 'Year of the Octopus' Along Britain's South Coast.
Unprecedented encounters of a remarkably clever cephalopod over the summer months have prompted the naming of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.
A Perfect Storm Leading to an Explosion
An unusually warm winter and then a remarkably hot spring triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, across the southwestern peninsula.
“The volume of octopuses caught was of the order of about over a dozen times what we would normally expect in Cornish waters,” explained an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were found in these waters this year – representing a massive jump from historical averages.”
*Octopus vulgaris* is indigenous to UK waters but typically so rare it is infrequently encountered. A sudden increase is the result of a combination of a mild winter and a warm breeding season. These ideal conditions meant increased juvenile survival, possibly in part fuelled by significant populations of a favored prey species seen in the area.
An Uncommon Occurrence
The last time, a population surge of this scale this significant was recorded in the 1950s, with archival data indicating the last bloom prior to that was in the turn of the 20th century.
The sheer quantity of octopuses meant they could be easily spotted in nearshore environments for a rare occurrence. Video footage show octopuses being sociable – contrary to their normally lone nature – and moving along the ocean floor on their tentacle tips. A curious octopus was even filmed grabbing a diver's camera.
“The first time I dived in that area this year I saw five octopuses,” the officer added. “And these are big. There are two types in UK waters. One species is smaller, the size of a ball, but these common octopuses can be reaching impressive sizes.”
Looking Ahead & Coastal Highlights
If conditions remain mild heading into next year could lead to another surge next year, because historically, in similar situations, the blooms have repeated for two years running.
“Still, the chances are low, looking at history, that it will go on for a long time,” they said. “Marine life is unpredictable these days so it’s hard to forecast.”
The assessment also noted other “surprises, successes and joyful moments” around the UK coastline, including:
- A record number of gray seals recorded in one northern region.
- Record numbers of puffins on an island off Wales.
- The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
- A variable blenny found off the coast of Sussex for the first occasion.
Environmental Concerns
Not everything was good news, however. “The calendar year was marked by marine incidents,” stated an expert. “A major tanker collision in March and an accidental discharge of tonnes of plastic biobeads off the southern coast served as stark reminders. Staff and volunteers are putting in immense work to defend and heal our coasts.”