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

Exceptionally high observations of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as the octopus's year in a seasonal assessment of Britain’s seas.

Ideal Conditions Leading to an Explosion

A mild winter and then a very warm springtime triggered a massive influx of *Octopus vulgaris* to take up residence along England’s south coast, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was of the order of about 13 times what we would typically see in the waters around Cornwall,” stated an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were found in UK waters this year – representing a massive jump from what is typical.”

The Mediterranean octopus is indigenous to UK waters but usually so scarce it is infrequently encountered. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by abundant stocks of spider crabs seen in the area.

A Historic Event

The last time, a population surge of this scale of this size was recorded in the mid-20th century, with historical records indicating the previous major event was in 1900.

The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and ambulating along the bottom on the tips of their limbs. One creature was even recorded reaching for an underwater camera.

“The first time I dived there this year I saw multiple octopuses,” they noted. “They are sizeable. There are two types in the region. The curled octopus is rather small, about the size of a football, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

Another mild winter this coming winter could lead to another surge next year, 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 cautioned. “The ocean is full of surprises currently so it’s a very uncertain scenario.”

The assessment also celebrated further encouraging coastal sightings around the UK coastline, including:

• Highest-ever counts of gray seals observed in Cumbria.
• Exceptional populations of the iconic seabirds on Skomer.
• The first recording of a rare sea slug in a northern county, usually found in the south-west.
• A type of blenny found off the coast of a southern county for the first time.

Environmental Concerns

Not everything was good news, however. “The year was bookended by environmental disasters,” stated an expert. “A significant shipping incident in March and an accidental discharge of plastic pollution off the southern coast were serious issues. Conservation teams are putting in immense work to safeguard and rehabilitate our coasts.”