2025 Declared 'The Octopus Year' Off England's South Coast.

Unprecedented sightings of a remarkably clever cephalopod this past summer have resulted in the declaration of 2025 as the year for octopuses in an annual review of the nation's marine environment.

A Perfect Storm Leading to an Explosion

A gentle winter and then an exceptionally warm spring prompted a huge population of Mediterranean octopuses to take up residence along England’s south coast, across the southwestern peninsula.

“The scale of the catch was of the order of about thirteen times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were present in UK waters this year – which is a significant rise from the norm.”

*Octopus vulgaris* is native to these waters but ordinarily in such small numbers it is rarely seen. A sudden increase is the result of the dual effect of a mild winter and favorable spring temperatures. This perfect scenario meant increased juvenile survival, possibly in part fuelled by large numbers of a favored prey species noted in recent years.

A Historic Event

Previously, a population surge of this scale comparable was recorded in the mid-20th century, with historical records indicating the last bloom prior to that happened in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in coastal areas for the first time in living memory. Video footage show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the seabed on the tips of their limbs. One creature was even filmed grabbing a diver's 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 these waters. One species is rather small, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Predictions and Marine Joy

A second gentle winter going into 2026 meant it was possible another surge next year, because based on records, under these conditions, events have occurred consecutively for two years in a row.

“Still, the chances are low, based on past events, that it will persist indefinitely,” they cautioned. “The ocean is full of surprises currently so it’s quite an unpredictable situation.”

The annual review also highlighted further encouraging coastal sightings across British shores, including:

• Highest-ever counts of grey seals observed in Cumbria.
• Record numbers of the iconic seabirds on a Welsh island.
• A first-ever sighting of an unusual mollusc in a northern county, normally residing farther south.
• A type of blenny found off the coast of Sussex for the first time.

Environmental Concerns

The year had its low points, however. “The period was framed by marine incidents,” noted a conservation leader. “A major tanker collision in March and a spill of plastic pollution off the southern coast were serious issues. Staff and volunteers are making huge efforts to protect and restore our coasts.”