2025 Declared 'The Octopus Year' Off England's South Coast.
Record-breaking encounters of a remarkably clever cephalopod this past summer have led to the naming of 2025 as the octopus's year in a seasonal assessment of the nation's marine environment.
A Confluence of Factors Leading to an Explosion
An unusually warm winter followed by an exceptionally warm spring prompted a massive influx of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The scale of the catch was approximately 13 times what we would typically see in this region,” explained a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were found in British seas this year – representing a massive jump from the norm.”
*Octopus vulgaris* is native to UK waters but typically so rare it is infrequently encountered. A population bloom is attributed to a combination of a mild winter and favorable spring temperatures. These ideal conditions meant more larvae, potentially supported by significant populations of other marine life also recorded.
A Historic Event
The last time, a population surge of this scale of this size was documented in the mid-20th century, with archival data indicating the one before that was in 1900.
The remarkable abundance of octopuses meant they could be readily observed in nearshore environments for the first time in recent history. Underwater recordings show octopuses congregating together – they are usually solitary – and ambulating along the bottom on their arm ends. One creature was even filmed grabbing a diver's camera.
“During a first dive in that area this year I saw multiple octopuses,” the officer added. “And these are big. Two kinds exist in the region. One species is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”
Future Prospects and Other Surprises
If conditions remain mild heading into next year meant it was possible another surge next year, because in the past, under these conditions, populations have surged again for two years in a row.
“Still, the chances are low, based on past events, that it will go on for a long time,” they said. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”
The assessment also celebrated further encouraging coastal sightings around the UK coastline, including:
- A record number of grey seals recorded in one northern region.
- Peak numbers of the iconic seabirds on an island off Wales.
- A first-ever sighting of an unusual mollusc in a northern county, normally residing farther south.
- A type of blenny discovered off the coast of Sussex for the first occasion.
A Note of Caution
Not everything was good news, however. “The year was bookended by ecological challenges,” said a head of marine conservation. “A major tanker collision in March and a spill of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to safeguard and rehabilitate our coasts.”
