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

Record-breaking encounters of a supremely intelligent sea creature over the summer months have resulted in the declaration of 2025 as the year for octopuses in a yearly report of the nation's marine environment.

A Perfect Storm for a Population Boom

A gentle winter followed by a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to take up residence along England’s south coast, across the southwestern peninsula.

“The volume of octopuses caught was roughly thirteen times what we would usually anticipate in this region,” explained an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were present in British seas this year – that’s a huge increase from what is typical.”

The common octopus is native to UK waters but ordinarily in such small numbers it is infrequently encountered. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. This perfect scenario meant more larvae, maybe aided by significant populations of spider crabs also recorded.

A Rare Phenomenon

The most recent occasion, such an octopus proliferation this significant was recorded in the 1950s, with archival data indicating the previous major event occurred in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in nearshore environments for the first time in recent history. Underwater recordings show octopuses congregating together – they are usually solitary – and “walking” along the ocean floor on their tentacle tips. A curious octopus was even seen investigating a diver's camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “And these are big. We have two species in the region. The curled octopus is smaller, the size of a ball, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 meant it was possible another surge 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. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”

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

• Unprecedented numbers of gray seals observed in one northern region.
• Record numbers of puffins on a Welsh island.
• The initial discovery of a rare sea slug in a northern county, usually found in the south-west.
• A variable blenny discovered off the coast of a southern county for the first occasion.

A Note of Caution

Challenges were also present, however. “The year was bookended by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of industrial pellets off the southern coast were serious issues. Conservation teams are making huge efforts to safeguard and rehabilitate our marine habitats.”