2025 Hailed as the 'Year of the Octopus' Off England's Southern Shores.

Exceptionally high encounters of one of the world's most intelligent invertebrates this past summer have resulted in the designation of 2025 as the octopus's year in an annual review of Britain’s seas.

A Confluence of Factors for a Population Boom

An unusually warm winter followed by a very warm springtime prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was of the order of about thirteen times what we would normally expect in the waters around Cornwall,” stated a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were caught in UK waters this year – which is a significant rise from what is typical.”

*Octopus vulgaris* is found in UK waters but typically so rare it is rarely seen. A population bloom is attributed to a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, possibly in part fuelled by significant populations of other marine life also recorded.

A Historic Event

Previously, an octopus bloom of this size was documented in the 1950s, with archival data indicating the last bloom prior to that happened 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 being sociable – they are usually solitary – and “walking” along the ocean floor on their arm ends. One creature was even recorded reaching for a diver's camera.

“On my initial dive in that area this year I saw multiple octopuses,” the officer added. “They are large specimens. There are two types in the region. One species is rather small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Predictions and Marine Joy

A second gentle winter this coming winter meant it was possible another surge next year, because historically, in similar situations, events have occurred consecutively for two consecutive years.

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

The report also highlighted additional positive marine news around the UK coastline, including:

• A record number of grey seals seen in Cumbria.
• Exceptional populations of puffins on a Welsh island.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A Mediterranean fish species discovered off the coast of Sussex for the inaugural time.

Not All Positive News

Not everything was good news, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A significant shipping incident in the North Sea and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our marine habitats.”