2025 Hailed as 'The Octopus Year' Along England's Southern Shores.
Record-breaking observations of one of the world's most intelligent invertebrates during the summer season have led to the naming of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment.
A Perfect Storm Driving a Surge
An unusually warm winter followed by a remarkably hot spring triggered a huge population of common octopuses (*Octopus vulgaris*) to take up residence along England’s south coast, across the southwestern peninsula.
“The volume of octopuses caught was approximately thirteen times what we would typically see in this region,” commented a marine life specialist. “Based on the totals, nearly a quarter of a million octopuses were found in these waters this year – that’s a huge increase from what is typical.”
*Octopus vulgaris* is indigenous to these waters but usually so scarce it is seldom observed. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, potentially supported by large numbers of spider crabs also recorded.
A Historic Event
The last time, such an octopus proliferation this significant was documented in the mid-20th century, with archival data indicating the last bloom prior to that occurred in 1900.
The huge numbers of octopuses meant they could be frequently seen in nearshore environments for a rare occurrence. Video footage show octopuses congregating together – they are usually solitary – and “walking” along the seabed on their arm ends. One individual was even seen investigating an underwater camera.
“The first time I dived there this year I saw five octopuses,” the specialist continued. “They are large specimens. Two kinds exist in UK waters. One species is smaller, football-sized, but these common octopuses can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
A second gentle winter this coming winter meant it was possible a second bloom in 2026, because historically, under these conditions, the blooms have repeated for two years in a row.
“Still, the chances are low, looking at history, that it will persist indefinitely,” they said. “The ocean is full of surprises at the moment so it’s a very uncertain scenario.”
The annual review also highlighted other “surprises, successes and joyful moments” along the coast, including:
- A record number of gray seals seen in one northern region.
- Peak numbers of puffins on Skomer.
- The initial discovery of a rare sea slug in Yorkshire, normally residing farther south.
- A Mediterranean fish species spotted off the coast of a southern county for the first time.
A Note of Caution
The year had its low points, however. “The year was bookended by marine incidents,” stated an expert. “A significant shipping incident in March and a spill of tonnes of plastic biobeads off the southern coast served as stark reminders. Dedicated individuals are making huge efforts to defend and heal our marine habitats.”