2025 Declared the 'Year of the Octopus' Off Britain's South Coast.

Record-breaking observations of a supremely intelligent sea creature during the summer season have resulted in the designation of 2025 as the octopus's year in an annual review of the nation's marine environment.

A Perfect Storm Leading to an Explosion

A gentle winter coupled with an exceptionally warm spring triggered a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula.

“The scale of the catch was approximately 13 times what we would typically see in this region,” commented an ocean conservation expert. “Based on the totals, nearly a quarter of a million octopuses were caught in British seas this year – that’s a huge increase from the norm.”

*Octopus vulgaris* is native to these waters but ordinarily in such small numbers it is infrequently encountered. An explosive growth is attributed to a combination of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, maybe aided by abundant stocks of other marine life noted in recent years.

An Uncommon Occurrence

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

The huge numbers of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and moving along the bottom on their arm ends. One creature was even seen investigating an underwater camera.

“The first time I dived in that area this year I saw five octopuses,” the specialist continued. “And these are big. There are two types in the region. The curled octopus is rather small, the size of a ball, but these common octopuses can be up to a metre and a half wide.”

Future Prospects and Other Surprises

A second gentle winter going into 2026 suggests the potential a repeat event the following year, because based on records, with such patterns, the blooms have repeated for two years in a row.

“However, it is unlikely, looking at history, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

The report also celebrated additional positive marine news around the UK coastline, including:

• A record number of grey seals recorded in Cumbria.
• Record numbers of the iconic seabirds on a Welsh island.
• The first recording of an unusual mollusc in Yorkshire, typically a southwestern species.
• A Mediterranean fish species spotted off the coast of a southern county for the first occasion.

Not All Positive News

Challenges were also present, however. “The year was bookended by marine incidents,” stated an expert. “A major tanker collision in the North Sea and a spill of industrial pellets off the Sussex coast served as stark reminders. Staff and volunteers are putting in immense work to defend and heal our shorelines.”