2025 Declared 'The Octopus Year' Along Britain's Southern Shores.

Record-breaking observations of one of the world's most intelligent invertebrates this past summer have prompted the declaration of 2025 as “the year of the octopus” in a seasonal assessment of UK coastal waters.

Ideal Conditions for a Population Boom

An unusually warm winter coupled with a very warm springtime prompted a massive influx of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, 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, nearly a quarter of a million octopuses were found in UK waters this year – which is a significant rise from historical averages.”

*Octopus vulgaris* is native to British seas but ordinarily in such small numbers it is seldom observed. A sudden increase is attributed to a combination of gentle winter conditions and favorable spring temperatures. This perfect scenario meant more larvae, possibly in part fuelled by significant populations of other marine life noted in recent years.

A Historic Event

The most recent occasion, an octopus bloom this significant was observed in the 1950s, with past documentation indicating the previous major event occurred in 1900.

The huge numbers of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Video footage show octopuses congregating together – contrary to their normally lone nature – and “walking” along the bottom on their arm ends. One individual was even recorded reaching for a diver's camera.

“On my initial dive in that area this year I saw five octopuses,” the officer added. “They are sizeable. There are two types in UK waters. The curled octopus is rather small, football-sized, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter heading into next year suggests the potential a second bloom in 2026, because based on records, with such patterns, the blooms have repeated for two consecutive years.

“However, it is unlikely, looking at history, that it will persist indefinitely,” they stated. “But the sea keeps giving us surprises currently so it’s hard to forecast.”

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

• A record number of gray seals seen in one northern region.
• Exceptional populations of the iconic seabirds on an island off Wales.
• A first-ever sighting of an unusual mollusc in a northern county, normally residing farther south.
• A Mediterranean fish species discovered off the coast of Sussex for the first occasion.

Environmental Concerns

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