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

Exceptionally high observations of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Perfect Storm Driving a Surge

A gentle winter coupled with a very warm springtime catalyzed unprecedented numbers of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The volume of octopuses caught was roughly 13 times what we would typically see in the waters around Cornwall,” commented an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were found in UK waters this year – representing a massive jump from the norm.”

The Mediterranean octopus is native to these waters but typically so rare it is seldom observed. An explosive growth is attributed to the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by large numbers of other marine life seen in the area.

A Rare Phenomenon

Previously, a population surge of this scale this significant was recorded in 1950, with past documentation indicating the one before that was in the turn of the 20th century.

The huge numbers of octopuses meant they could be readily observed in coastal areas for a rare occurrence. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and ambulating along the seabed on their tentacle tips. A curious octopus was even filmed grabbing a diver's camera.

“During a first dive off the Lizard peninsula this year I saw five of these creatures,” they noted. “And these are big. There are two types in the region. One species is rather small, football-sized, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Future Prospects and Other Surprises

If conditions remain mild this coming winter meant it was possible another surge next year, because based on records, in similar situations, populations have surged again for two years in a row.

“However, it is unlikely, from previous blooms, that it will become a permanent fixture,” they stated. “Marine life is unpredictable currently so it’s hard to forecast.”

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

• Highest-ever counts of gray seals seen in Cumbria.
• Peak numbers of puffins on an island off Wales.
• A first-ever sighting of an unusual mollusc in a northern county, usually found in the south-west.
• A variable blenny found off the coast of Sussex for the first occasion.

Environmental Concerns

Not everything was good news, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A significant shipping incident in March and a spill of plastic pollution off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to defend and heal our shorelines.”