2025 Declared the 'Year of the Octopus' Along England's South Coast.

Unprecedented sightings of a supremely intelligent sea creature over the summer months have led to the designation of 2025 as “the year of the octopus” in an annual review of Britain’s seas.

Ideal Conditions for a Population Boom

A gentle winter coupled with a very warm springtime prompted a massive influx of Mediterranean octopuses to settle along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The scale of the catch was approximately thirteen times what we would usually anticipate in the waters around Cornwall,” explained a marine conservation officer. “Based on the totals, around 233 thousand octopuses were found in UK waters this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is found in UK waters but usually so scarce it is seldom observed. A sudden increase is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant increased juvenile survival, possibly in part fuelled by significant populations of spider crabs noted in recent years.

An Uncommon Occurrence

The most recent occasion, an octopus bloom comparable was documented in the 1950s, with past documentation indicating the one before that occurred in the turn of the 20th century.

The huge numbers of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the bottom on their arm ends. One individual was even filmed grabbing a diver's camera.

“During a first dive there this year I saw multiple octopuses,” the officer added. “They are large specimens. Two kinds exist in these waters. One species is quite small, the size of a ball, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Predictions and Marine Joy

A second gentle winter this coming winter could lead to another surge next year, because in the past, under these conditions, 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. “The ocean is full of surprises at the moment so it’s hard to forecast.”

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

• Unprecedented numbers of grey seals recorded in Cumbria.
• Record numbers of puffins on an island off Wales.
• A first-ever sighting of a rare sea slug in Yorkshire, typically a southwestern species.
• A Mediterranean fish species discovered off the coast of a southern county for the first occasion.

A Note of Caution

Not everything was good news, however. “The calendar year was marked by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of plastic pollution off the Sussex coast served as stark reminders. Conservation teams are working tirelessly to defend and heal our coasts.”