2025 Declared The Year for Octopuses Along Britain's Southern Shores.

Unprecedented observations of one of the world's most intelligent invertebrates this past summer have led to the designation of 2025 as the year for octopuses in a yearly report of Britain’s seas.

A Confluence of Factors Leading to an Explosion

An unusually warm winter and then a remarkably hot spring triggered a huge population of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.

“The scale of the catch was of the order of about thirteen times what we would usually anticipate in the waters around Cornwall,” commented a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were present in British seas this year – representing a massive jump from what is typical.”

*Octopus vulgaris* is indigenous to UK waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is the result of the dual effect of gentle winter conditions and a warm breeding season. These ideal conditions meant increased juvenile survival, possibly in part fuelled by significant populations of spider crabs also recorded.

A Historic Event

Previously, a population surge of this scale of this size was observed in 1950, with past documentation indicating the one before that occurred in 1900.

The sheer quantity of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Underwater recordings show octopuses congregating together – they are usually solitary – and “walking” along the seabed on their tentacle tips. One creature was even seen investigating an underwater camera.

“The first time I dived in that area this year I saw five octopuses,” the officer added. “They are large specimens. We have two species in the region. The curled octopus is rather small, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

Another mild winter this coming winter could lead to another surge next year, because in the past, under these conditions, events have occurred consecutively for two consecutive years.

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

The assessment also celebrated additional positive marine news along the coast, including:

• A record number of grey seals recorded in one northern region.
• Record numbers of puffins on a Welsh island.
• The first recording of an unusual mollusc in Yorkshire, normally residing farther south.
• A type of blenny discovered off the coast of a southern county for the first occasion.

A Note of Caution

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