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

Unprecedented observations of a remarkably clever cephalopod this past summer have led to the designation of 2025 as the year for octopuses in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

A gentle winter and then a remarkably hot spring prompted a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The reported landings was of the order of about thirteen times what we would normally expect in this region,” stated a marine life specialist. “When we added up the numbers, around 233 thousand octopuses were caught in these waters this year – representing a massive jump from what is typical.”

The common octopus is indigenous to British seas but typically so rare it is infrequently encountered. A population bloom is caused by the dual effect of a mild winter and a warm breeding season. This perfect scenario meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs also recorded.

A Historic Event

Previously, an octopus bloom comparable was documented in 1950, with historical records indicating the last bloom prior to that happened in 1900.

The huge numbers of octopuses meant they could be easily spotted in nearshore environments for the first time in living memory. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the bottom on their arm ends. A curious octopus was even recorded reaching for a diver's camera.

“On my initial dive in that area this year I saw multiple octopuses,” the specialist continued. “They are sizeable. Two kinds exist in UK waters. One species is smaller, football-sized, but these newcomers can be up to a metre and a half wide.”

Predictions and Marine Joy

If conditions remain mild heading into next year could lead to a second bloom in 2026, because in the past, under these conditions, the blooms have repeated for two years running.

“Still, the chances are low, looking at history, that it will become a permanent fixture,” they cautioned. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

The report also celebrated additional positive marine news across British shores, including:

• Highest-ever counts of gray seals seen in Cumbria.
• Record numbers of puffins on a Welsh island.
• A first-ever sighting of an unusual mollusc in Yorkshire, typically a southwestern species.
• A variable blenny found off the coast of Sussex for the first time.

Not All Positive News

Challenges were also present, however. “The year was bookended by marine incidents,” stated an expert. “A significant shipping incident in the North Sea and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are working tirelessly to protect and restore our shorelines.”