2025 Declared 'The Octopus Year' Off Britain's Southern Shores.
Record-breaking sightings of one of the world's most intelligent invertebrates over the summer months have resulted in the designation of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.
Ideal Conditions for a Population Boom
A gentle winter and then an exceptionally warm spring prompted unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The reported landings was of the order of about thirteen times what we would typically see in this region,” commented an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were present in these waters this year – which is a significant rise from the norm.”
*Octopus vulgaris* is native to British seas but ordinarily in such small numbers it is infrequently encountered. A sudden increase is caused by the dual effect of a mild winter and a warm breeding season. These ideal conditions meant more larvae, maybe aided by large numbers of spider crabs seen in the area.
A Historic Event
The most recent occasion, a population surge of this scale comparable was recorded in the mid-20th century, with past documentation indicating the one before that happened in 1900.
The sheer quantity of octopuses meant they could be frequently seen in coastal areas for the first time in living memory. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the ocean floor on their arm ends. One individual was even filmed grabbing submarine recording equipment.
“On my initial dive there this year I saw five of these creatures,” they noted. “And these are big. There are two types in these waters. The curled octopus is quite small, the size of a ball, but the *Octopus vulgaris* can be reaching impressive sizes.”
Future Prospects and Other Surprises
Another mild winter heading into next year suggests the potential another surge the following year, because in the past, with such patterns, the blooms have repeated for two years in a row.
“But, it's improbable, looking at history, that it will persist indefinitely,” they stated. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”
The annual review also celebrated further encouraging coastal sightings across British shores, including:
- Highest-ever counts of grey seals observed in Cumbria.
- Exceptional populations of puffins on Skomer.
- The first recording of a rare sea slug in Yorkshire, normally residing farther south.
- A type of blenny discovered off the coast of Sussex for the first time.
Not All Positive News
Challenges were also present, however. “The period was framed by ecological challenges,” stated an expert. “A major tanker collision in the North Sea and an accidental discharge of plastic pollution off the southern coast highlighted ongoing threats. Staff and volunteers are making huge efforts to protect and restore our shorelines.”
