2025 Proclaimed the 'Year of the Octopus' Off Britain's South Coast.

Record-breaking observations of a supremely intelligent sea creature during the summer season have led to the naming of 2025 as the year for octopuses in a seasonal assessment of UK coastal waters.

A Perfect Storm for a Population Boom

An unusually warm winter and then a very warm springtime catalyzed unprecedented numbers of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was approximately thirteen times what we would typically see in the waters around Cornwall,” explained a marine conservation officer. “Based on the totals, nearly a quarter of a million octopuses were present in these waters this year – that’s a huge increase from the norm.”

The common octopus is found in British seas but typically so rare it is rarely seen. A population bloom is the result of the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, maybe aided by large numbers of spider crabs seen in the area.

A Historic Event

The most recent occasion, an octopus bloom comparable was documented in the mid-20th century, with past documentation indicating the last bloom prior to that occurred in 1900.

The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the seabed on their arm ends. One creature was even seen investigating an underwater camera.

“During a first dive there this year I saw five of these creatures,” they noted. “They are large specimens. There are two types in UK waters. The curled octopus is quite small, football-sized, but these common octopuses can be reaching impressive sizes.”

Predictions and Marine Joy

If conditions remain mild this coming winter could lead to a repeat event the following year, because based on records, under these conditions, events have occurred consecutively for two consecutive years.

“But, it's improbable, looking at history, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”

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

• A record number of grey seals recorded in one northern region.
• Record numbers of the iconic seabirds on Skomer.
• The first recording of an unusual mollusc in a northern county, normally residing farther south.
• A type of blenny discovered off the coast of Sussex for the inaugural time.

Environmental Concerns

The year had its low points, however. “The calendar year was marked by marine incidents,” noted a conservation leader. “A significant shipping incident in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Dedicated individuals are putting in immense work to defend and heal our marine habitats.”