2025 Declared the 'Year of the Octopus' Off Britain's Southern Shores.

Record-breaking encounters of a remarkably clever cephalopod over the summer months have resulted in the naming of 2025 as the year for octopuses in an annual review of UK coastal waters.

Ideal Conditions Driving a Surge

A mild winter coupled with a very warm springtime prompted a massive influx of Mediterranean octopuses to settle along England’s south coast, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly over a dozen times what we would usually anticipate in the waters around Cornwall,” explained an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were present in UK waters this year – which is a significant rise from historical averages.”

*Octopus vulgaris* is found in British seas but typically so rare it is rarely seen. An explosive growth is caused by a combination of a mild winter and a warm breeding season. These ideal conditions meant a higher survival rate for young, maybe aided by large numbers of a favored prey species also recorded.

A Historic Event

The last time, an octopus bloom comparable was documented in the 1950s, with historical records indicating the one before that was in the turn of the 20th century.

The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Video footage show octopuses congregating together – contrary to their normally lone nature – and moving along the ocean floor on their arm ends. One individual was even filmed grabbing a diver's camera.

“During a first dive there this year I saw five of these creatures,” they noted. “They are sizeable. We have two species in the region. The curled octopus is rather small, football-sized, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter this coming winter could lead to a second bloom the following year, because in the past, under these conditions, 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 stated. “The ocean is full of surprises currently so it’s a very uncertain scenario.”

The report also highlighted other “surprises, successes and joyful moments” across British shores, including:

• Highest-ever counts of grey seals observed in one northern region.
• Exceptional populations of puffins on an island off Wales.
• The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
• A type of blenny discovered off the coast of Sussex for the inaugural time.

Not All Positive News

The year had its low points, however. “The calendar year was marked by marine incidents,” noted a conservation leader. “A significant shipping incident in March and a spill of tonnes of plastic biobeads off the southern coast were serious issues. Staff and volunteers are working tirelessly to defend and heal our coasts.”