2025 Proclaimed The Year for Octopuses Off England's Southern Shores.

Exceptionally high observations of a remarkably clever cephalopod over the summer months have led to the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.

A Confluence of Factors Driving a Surge

An unusually warm winter and then a remarkably hot spring triggered a huge population of common octopuses (*Octopus vulgaris*) to establish themselves along England’s south coast, from Penzance in Cornwall to south Devon.

“The reported landings was approximately 13 times what we would typically see in the waters around Cornwall,” explained an ocean conservation expert. “Calculating the figures, around 233 thousand octopuses were found in UK waters this year – that’s a huge increase from what is typical.”

The common octopus is indigenous to these waters but ordinarily in such small numbers it is seldom observed. A sudden increase is caused by the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, potentially supported by significant populations of a favored prey species also recorded.

An Uncommon Occurrence

The last time, an octopus bloom this significant was documented in the 1950s, with archival data indicating the last bloom prior to that occurred in 1900.

The huge numbers of octopuses meant they could be readily observed in coastal areas for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even seen investigating an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. Two kinds exist in UK waters. The curled octopus is quite small, about the size of a football, but these common octopuses can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

Another mild winter heading into next year meant it was possible a repeat event in 2026, because historically, with such patterns, the blooms have repeated for two years in a row.

“However, it is unlikely, based on past events, that it will become a permanent fixture,” they stated. “Marine life is unpredictable at the moment so it’s a very uncertain scenario.”

The assessment also noted further encouraging coastal sightings along the coast, including:

• Highest-ever counts of grey seals seen in Cumbria.
• Record numbers of the iconic seabirds on Skomer.
• The first recording of a rare sea slug in Yorkshire, typically a southwestern species.
• A Mediterranean fish species spotted off the coast of a southern county for the first occasion.

A Note of Caution

Not everything was good news, however. “The period was framed by ecological challenges,” stated an expert. “A major tanker collision in March and an accidental discharge of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Staff and volunteers are working tirelessly to protect and restore our coasts.”