2025 Declared The Year for Octopuses Along England's Southern Shores.

Exceptionally high observations of a supremely intelligent sea creature this past summer have led to the designation of 2025 as the year for octopuses in a seasonal assessment of the nation's marine environment.

A Perfect Storm Driving a Surge

An unusually warm winter and then a remarkably hot spring triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, spanning the Cornish and Devonian coasts.

“The scale of the catch was of the order of about thirteen times what we would usually anticipate in the waters around Cornwall,” commented a marine life specialist. “Calculating the figures, around 233 thousand octopuses were found in British seas this year – which is a significant rise from historical averages.”

The common octopus is native to British seas but ordinarily in such small numbers it is seldom observed. A population bloom is caused by a combination of gentle winter conditions and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, maybe aided by abundant stocks of other marine life noted in recent years.

An Uncommon Occurrence

Previously, such an octopus proliferation this significant was recorded in the mid-20th century, with historical records indicating the previous major event occurred in 1900.

The huge numbers of octopuses meant they could be frequently seen in nearshore environments for a rare occurrence. Diver videos show octopuses being sociable – they are usually solitary – and “walking” along the seabed on their tentacle tips. One individual was even filmed grabbing submarine recording equipment.

“The first time I dived in that area this year I saw multiple octopuses,” they noted. “They are large specimens. There are two types in these waters. The curled octopus is smaller, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter going into 2026 could lead to a second bloom the following year, because based on records, under these conditions, the blooms have repeated for two consecutive years.

“But, it's improbable, based on past events, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises currently so it’s quite an unpredictable situation.”

The assessment also celebrated additional positive marine news along the coast, including:

• Highest-ever counts of grey seals seen in Cumbria.
• Exceptional populations of the iconic seabirds on an island off Wales.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A variable blenny discovered off the coast of a southern county for the inaugural time.

Environmental Concerns

The year had its low points, however. “The period was framed by environmental disasters,” stated an expert. “A major tanker collision in March and an accidental discharge of industrial pellets off the Sussex coast served as stark reminders. Staff and volunteers are making huge efforts to protect and restore our coasts.”