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

Record-breaking encounters of one of the world's most intelligent invertebrates during the summer season have resulted in the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters.

A Perfect Storm Driving a Surge

A mild winter followed by an exceptionally warm spring triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The reported landings was of the order of about over a dozen times what we would usually anticipate in the waters around Cornwall,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were found in these waters this year – which is a significant rise from the norm.”

The Mediterranean octopus is found in these waters but typically so rare it is seldom observed. A population bloom is the result of the dual effect of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, maybe aided by large numbers of other marine life seen in the area.

A Rare Phenomenon

The last time, an octopus bloom comparable was documented in the 1950s, with archival data indicating the one before that happened in 1900.

The huge numbers of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and “walking” along the ocean floor on their arm ends. One creature was even recorded reaching for submarine recording equipment.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are large specimens. We have two species in the region. The curled octopus is rather small, football-sized, but these common octopuses can be reaching impressive sizes.”

Future Prospects and Other Surprises

If conditions remain mild going into 2026 could lead to a repeat event next year, because based on records, under these conditions, populations have surged again for two years in a row.

“Still, the chances are low, based on past events, that it will become a permanent fixture,” they said. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”

The annual review also noted other “surprises, successes and joyful moments” along the coast, including:

• Unprecedented numbers of grey seals recorded in Cumbria.
• Record numbers of puffins on an island off Wales.
• The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
• A variable blenny spotted off the coast of Sussex for the first occasion.

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 an accidental discharge of plastic pollution off the southern coast were serious issues. Staff and volunteers are making huge efforts to safeguard and rehabilitate our coasts.”