2025 Proclaimed The Year for Octopuses Along Britain's South Coast.

Record-breaking observations of one of the world's most intelligent invertebrates this past summer have led to 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

A mild winter and then an exceptionally warm spring prompted unprecedented numbers of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The volume of octopuses caught was roughly thirteen times what we would normally expect in the waters around Cornwall,” stated a marine life specialist. “Based on the totals, approximately 233,000 octopuses were caught in UK waters this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is found in these waters but ordinarily in such small numbers it is rarely seen. A population bloom is the result of the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, maybe aided by significant populations of other marine life seen in the area.

A Rare Phenomenon

The last time, an octopus bloom of this size was documented in the 1950s, with archival data indicating the last bloom prior to that happened in the turn of the 20th century.

The remarkable abundance of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – they are usually solitary – and moving along the seabed on the tips of their limbs. One creature was even seen investigating an underwater camera.

“The first time I dived there this year I saw five octopuses,” the officer added. “They are large specimens. There are two types in UK waters. The curled octopus is smaller, football-sized, but these newcomers can be up to a metre and a half wide.”

Predictions and Marine Joy

A second gentle winter this coming winter suggests the potential a repeat event in 2026, because in the past, with such patterns, populations have surged again for two years running.

“However, it is unlikely, based on past events, that it will go on for a long time,” they cautioned. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”

The annual review also celebrated further encouraging coastal sightings around the UK coastline, including:

• A record number of grey seals recorded in one northern region.
• Peak numbers of the iconic seabirds on an island off Wales.
• A first-ever sighting of an unusual mollusc in a northern county, typically a southwestern species.
• A variable blenny found off the coast of Sussex for the first occasion.

Not All Positive News

The year had its low points, however. “The period was framed by ecological challenges,” noted a conservation leader. “A significant shipping incident in March and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Conservation teams are working tirelessly to protect and restore our shorelines.”