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

Unprecedented encounters of a supremely intelligent sea creature during the summer season have resulted in the declaration of 2025 as the octopus's year in an annual review of UK coastal waters.

A Confluence of Factors Driving a Surge

An unusually warm winter coupled with a very warm springtime triggered a huge population of common octopuses (*Octopus vulgaris*) to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The reported landings was roughly 13 times what we would usually anticipate in Cornish waters,” stated a marine life specialist. “Based on the totals, nearly a quarter of a million octopuses were present in British seas this year – that’s a huge increase from historical averages.”

The common octopus is native 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. Such favorable circumstances meant a higher survival rate for young, maybe aided by abundant stocks of spider crabs noted in recent years.

A Historic Event

Previously, such an octopus proliferation of this size was documented in the 1950s, with past documentation indicating the previous major event occurred in the turn of the 20th century.

The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Underwater recordings show octopuses gathering in groups – they are usually solitary – and ambulating along the ocean floor on their arm ends. A curious octopus was even seen investigating an underwater camera.

“The first time I dived there this year I saw multiple octopuses,” they noted. “And these are big. There are two types in the region. The curled octopus is smaller, 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 a second bloom in 2026, because historically, in similar situations, populations have surged again for two consecutive years.

“But, it's improbable, looking at history, that it will become a permanent fixture,” they said. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

The report also noted other “surprises, successes and joyful moments” across British shores, including:

• Unprecedented numbers of grey seals seen in Cumbria.
• Exceptional populations of puffins on an island off Wales.
• The first recording of an unusual mollusc in Yorkshire, normally residing farther south.
• A Mediterranean fish species found off the coast of a southern county for the first time.

A Note of Caution

The year had its low points, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A significant shipping incident in the North Sea and an accidental discharge of plastic pollution off the Sussex coast highlighted ongoing threats. Staff and volunteers are making huge efforts to protect and restore our shorelines.”