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

Exceptionally high observations of a remarkably clever cephalopod during the summer season have resulted in the naming of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Confluence of Factors Leading to an Explosion

An unusually warm winter and then a very warm springtime prompted a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The reported landings was approximately thirteen times what we would normally expect in the waters around Cornwall,” explained an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were found in these waters this year – representing a massive jump from the norm.”

*Octopus vulgaris* is found in UK waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is caused by the dual effect of gentle winter conditions and a warm breeding season. These ideal conditions meant a higher survival rate for young, possibly in part fuelled by large numbers of other marine life seen in the area.

A Rare Phenomenon

Previously, such an octopus proliferation comparable was documented in the mid-20th century, with past documentation indicating the last bloom prior to that occurred in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Video footage show octopuses being sociable – they are usually solitary – and “walking” along the ocean floor on their arm ends. One creature was even recorded reaching for an underwater camera.

“The first time I dived in that area this year I saw five octopuses,” the specialist continued. “They are sizeable. There are two types in UK waters. One species is quite small, about the size of a football, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 suggests the potential another surge in 2026, because in the past, in similar situations, the blooms have repeated for two years running.

“But, it's improbable, based on past events, that it will become a permanent fixture,” they said. “Marine life is unpredictable these days so it’s hard to forecast.”

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

• A record number of grey seals seen in one northern region.
• Peak numbers of the iconic seabirds on a Welsh island.
• The initial discovery of a rare sea slug in a northern county, usually found in the south-west.
• A type of blenny found off the coast of a southern county for the first occasion.

Environmental Concerns

Challenges were also present, however. “The period was framed by marine incidents,” stated an expert. “A major tanker collision in the North Sea and the release of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Staff and volunteers are making huge efforts to defend and heal our marine habitats.”