2025 Hailed as The Year for Octopuses Off Britain's South Coast.

Exceptionally high sightings of a supremely intelligent sea creature over the summer months have led to the naming of 2025 as the octopus's year in a yearly report of UK coastal waters.

A Confluence of Factors Driving a Surge

A gentle winter coupled with a remarkably hot spring triggered unprecedented numbers of *Octopus vulgaris* to take up residence along the southern coastline of England, across the southwestern peninsula.

“The scale of the catch was roughly 13 times what we would normally expect in Cornish waters,” stated a marine life specialist. “Based on the totals, around 233 thousand octopuses were caught in UK waters this year – that’s a huge increase from historical averages.”

The Mediterranean octopus is found in British seas but typically so rare it is rarely seen. A sudden increase is the result of the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, possibly in part fuelled by abundant stocks of spider crabs also recorded.

A Historic Event

Previously, an octopus bloom this significant was recorded in the mid-20th century, with historical records indicating the previous major event occurred in 1900.

The sheer quantity of octopuses meant they could be easily spotted in nearshore environments for a rare occurrence. Diver videos show octopuses gathering in groups – unlike their typical solitary behavior – and moving along the bottom on their arm ends. One individual was even filmed grabbing submarine recording equipment.

“During a first dive there this year I saw multiple octopuses,” the specialist continued. “They are sizeable. There are two types in UK waters. One species is smaller, the size of a ball, but these newcomers can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

A second gentle winter going into 2026 suggests the potential a second bloom in 2026, because historically, in similar situations, the blooms have repeated for two years running.

“But, it's improbable, looking at history, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises these days so it’s hard to forecast.”

The report also celebrated additional positive marine news along the coast, including:

• Unprecedented numbers of gray seals observed in Cumbria.
• Exceptional populations of the iconic seabirds on an island off Wales.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A variable blenny 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,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Conservation teams are making huge efforts to protect and restore our marine habitats.”