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

Unprecedented sightings of a supremely intelligent sea creature over the summer months have prompted the designation of 2025 as the year for octopuses in a yearly report of the nation's marine environment.

Ideal Conditions for a Population Boom

A gentle winter and then a remarkably hot spring prompted unprecedented numbers of *Octopus vulgaris* to settle along the shores from Cornwall to Devon, across the southwestern peninsula.

“The reported landings was roughly over a dozen times what we would normally expect in Cornish waters,” explained a marine conservation officer. “Based on the totals, around 233 thousand octopuses were caught in British seas this year – which is a significant rise from the norm.”

*Octopus vulgaris* is indigenous to these waters but ordinarily in such small numbers it is rarely seen. A sudden increase is the result of the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant more larvae, maybe aided by large numbers of spider crabs also recorded.

A Rare Phenomenon

The most recent occasion, an octopus bloom comparable was recorded in the 1950s, with past documentation indicating the previous major event was in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Diver videos show octopuses gathering in groups – they are usually solitary – and ambulating along the bottom on their tentacle tips. One individual was even seen investigating an underwater camera.

“On my initial dive there this year I saw five of these creatures,” the specialist continued. “They are sizeable. Two kinds exist in these waters. The curled octopus is smaller, the size of a ball, but the *Octopus vulgaris* can be reaching impressive sizes.”

Future Prospects and Other Surprises

Another mild winter going into 2026 could lead to a second bloom next year, because in the past, with such patterns, events have occurred consecutively for two years running.

“Still, the chances are low, looking at history, that it will go on for a long time,” they cautioned. “The ocean is full of surprises these days so it’s hard to forecast.”

The report also celebrated further encouraging coastal sightings around the UK coastline, including:

• A record number of gray seals recorded in one northern region.
• Peak numbers of the iconic seabirds on Skomer.
• The initial discovery of an unusual mollusc in Yorkshire, normally residing farther south.
• A Mediterranean fish species spotted off the coast of a southern county for the inaugural time.

Not All Positive News

Challenges were also present, however. “The year was bookended by environmental disasters,” stated an expert. “A major tanker collision in March and the release of plastic pollution off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to defend and heal our marine habitats.”