2025 Declared the 'Year of the Octopus' Off England's South Coast.

Exceptionally high encounters of a supremely intelligent sea creature this past summer have led to the declaration of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.

A Perfect Storm Leading to an Explosion

A gentle winter coupled with an exceptionally warm spring catalyzed a huge population of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The scale of the catch was roughly over a dozen times what we would normally expect in Cornish waters,” explained a marine life specialist. “Calculating the figures, approximately 233,000 octopuses were caught in these waters this year – which is a significant rise from historical averages.”

*Octopus vulgaris* is indigenous to British seas but typically so rare it is seldom observed. An explosive growth is caused by the dual effect of a mild winter and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by large numbers of a favored prey species noted in recent years.

An Uncommon Occurrence

The most recent occasion, an octopus bloom comparable was documented in the mid-20th century, with past documentation indicating the previous major event occurred in 1900.

The sheer quantity of octopuses meant they could be readily observed in coastal areas for the first time in living memory. Diver videos show octopuses being sociable – contrary to their normally lone nature – and “walking” along the bottom on their tentacle tips. One creature was even seen investigating submarine recording equipment.

“During a first dive there this year I saw five octopuses,” they noted. “They are sizeable. Two kinds exist in these waters. The curled octopus is smaller, about the size of a football, but these newcomers can be reaching impressive sizes.”

Future Prospects and Other Surprises

A second gentle winter going into 2026 suggests the potential a repeat event the following year, because based on records, in similar situations, events have occurred consecutively for two years running.

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

The annual review also celebrated further encouraging coastal sightings across British shores, including:

• Highest-ever counts of gray seals recorded in one northern region.
• Exceptional populations of the iconic seabirds on Skomer.
• The first recording of a rare sea slug in Yorkshire, typically a southwestern species.
• A variable blenny spotted off the coast of Sussex for the first time.

Not All Positive News

The year had its low points, however. “The calendar year was marked by ecological challenges,” stated an expert. “A significant shipping incident in the North Sea and a spill of plastic pollution off the southern coast were serious issues. Conservation teams are making huge efforts to safeguard and rehabilitate our shorelines.”