2025 Proclaimed The Year for Octopuses Off England's Southern Shores.
Exceptionally high encounters of one of the world's most intelligent invertebrates during the summer season have led to the designation of 2025 as “the year of the octopus” in a seasonal assessment of the nation's marine environment.
A Confluence of Factors Driving a Surge
A mild winter coupled with a very warm springtime catalyzed unprecedented numbers of *Octopus vulgaris* to settle along England’s south coast, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was of the order of about thirteen times what we would typically see in this region,” stated a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were found in UK waters this year – that’s a huge increase from what is typical.”
The Mediterranean octopus is found in these waters but usually so scarce it is rarely seen. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, possibly in part fuelled by large numbers of a favored prey species seen in the area.
An Uncommon Occurrence
The last time, an octopus bloom comparable was recorded in 1950, with archival data indicating the one before that was in 1900.
The huge numbers of octopuses meant they could be easily spotted in coastal areas for a rare occurrence. Underwater recordings show octopuses gathering in groups – they are usually solitary – and ambulating along the bottom on the tips of their limbs. One individual was even filmed grabbing submarine recording equipment.
“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. We have two species in the region. The curled octopus is quite small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”
Future Prospects and Other Surprises
If conditions remain mild heading into next year suggests the potential a repeat event the following year, because in the past, under these conditions, populations have surged again for two years running.
“Still, the chances are low, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises these days so it’s hard to forecast.”
The report also highlighted further encouraging coastal sightings along the coast, including:
- A record number of gray seals observed in Cumbria.
- Record numbers of the iconic seabirds on an island off Wales.
- The first recording of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
- A Mediterranean fish species spotted off the coast of Sussex for the first time.
A Note of Caution
The year had its low points, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of industrial pellets off the southern coast served as stark reminders. Dedicated individuals are making huge efforts to defend and heal our coasts.”
