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

Exceptionally high encounters of a supremely intelligent sea creature this past summer have led to the naming of 2025 as the octopus's year in an annual review of the nation's marine environment.

A Perfect Storm Leading to an Explosion

An unusually warm winter followed by a remarkably hot spring prompted a massive influx of common octopuses (*Octopus vulgaris*) to establish themselves along England’s south coast, across the southwestern peninsula.

“The scale of the catch was approximately over a dozen times what we would usually anticipate in the waters around Cornwall,” stated an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were found in British seas this year – that’s a huge increase from historical averages.”

The common octopus is found in these waters but typically so rare it is rarely seen. An explosive growth is caused by the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant increased juvenile survival, possibly in part fuelled by significant populations of spider crabs noted in recent years.

A Historic Event

Previously, such an octopus proliferation this significant was observed in the mid-20th century, with historical records indicating the last bloom prior to that occurred in 1900.

The sheer quantity of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Underwater recordings show octopuses gathering in groups – unlike their typical solitary behavior – and moving along the ocean floor on their arm ends. One individual was even filmed grabbing submarine recording equipment.

“During a first dive in that area this year I saw multiple octopuses,” the specialist continued. “They are large specimens. Two kinds exist in these waters. One species is rather small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Predictions and Marine Joy

A second gentle winter this coming winter suggests the potential a second bloom the following year, because in the past, under these conditions, populations have surged again for two years in a row.

“However, it is unlikely, from previous blooms, that it will go on for a long time,” they cautioned. “Marine life is unpredictable these days so it’s quite an unpredictable situation.”

The assessment also highlighted other “surprises, successes and joyful moments” around the UK coastline, including:

• Unprecedented numbers of grey seals observed in Cumbria.
• Record numbers of puffins on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A Mediterranean fish species discovered off the coast of Sussex for the inaugural time.

A Note of Caution

The year had its low points, however. “The year was bookended by environmental disasters,” stated an expert. “A significant shipping incident in the North Sea and a spill of industrial pellets off the Sussex coast served as stark reminders. Staff and volunteers are working tirelessly to protect and restore our coasts.”