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

Exceptionally high encounters of a remarkably clever cephalopod during the summer season have led to the naming of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment.

A Confluence of Factors Leading to an Explosion

A mild winter coupled with a very warm springtime triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along England’s south coast, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly over a dozen times what we would normally expect in this region,” explained a marine life specialist. “Based on the totals, approximately 233,000 octopuses were caught in these waters this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is indigenous to UK waters but usually so scarce it is rarely seen. A sudden increase is attributed to the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, maybe aided by abundant stocks of spider crabs seen in the area.

A Rare Phenomenon

The last time, an octopus bloom this significant was observed in the 1950s, with archival data indicating the one before that was in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in nearshore environments for the first time in living memory. Diver videos show octopuses congregating together – they are usually solitary – and ambulating along the ocean floor on their arm ends. One individual was even recorded reaching for an underwater camera.

“On my initial dive in that area this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in UK waters. The curled octopus is smaller, about the size of a football, but these newcomers can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter this coming winter meant it was possible another surge the following year, because in the past, in similar situations, populations have surged again for two years in a row.

“Still, the chances are low, looking at history, that it will persist indefinitely,” they said. “Marine life is unpredictable these days so it’s quite an unpredictable situation.”

The annual review also highlighted additional positive marine news along the coast, including:

• A record number of grey seals recorded in Cumbria.
• Exceptional populations of puffins on a Welsh island.
• The first recording of an unusual mollusc in a northern county, normally residing farther south.
• A Mediterranean fish species discovered off the coast of a southern county for the inaugural time.

A Note of Caution

The year had its low points, however. “The period was framed by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the southern coast served as stark reminders. Staff and volunteers are making huge efforts to protect and restore our shorelines.”