2025 Declared the 'Year of the Octopus' Along England's Southern Shores.
Unprecedented encounters of a remarkably clever cephalopod this past summer have prompted the designation of 2025 as the year for octopuses in a yearly report of Britain’s seas.
A Perfect Storm Leading to an Explosion
An unusually warm winter and then a very warm springtime prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to establish themselves along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.
“The reported landings was approximately thirteen times what we would usually anticipate in the waters around Cornwall,” commented an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were present in these waters this year – that’s a huge increase from the norm.”
*Octopus vulgaris* is native to British seas but usually so scarce it is rarely seen. An explosive growth is the result of the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by abundant stocks of spider crabs also recorded.
A Rare Phenomenon
Previously, a population surge of this scale of this size was documented in 1950, with past documentation indicating the previous major event was in 1900.
The huge numbers of octopuses meant they could be readily observed in coastal areas for a rare occurrence. Diver videos show octopuses gathering in groups – unlike their typical solitary behavior – and ambulating along the ocean floor on their arm ends. One individual was even seen investigating a diver's camera.
“During a first dive in that area this year I saw five of these creatures,” the specialist continued. “And these are big. There are two types in the region. One species is smaller, about the size of a football, but the *Octopus vulgaris* can be with a span of 1.5 meters.”
Future Prospects and Other Surprises
Another mild winter heading into next year meant it was possible a repeat event next year, because based on records, under these conditions, populations have surged again for two years in a row.
“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they cautioned. “Marine life is unpredictable at the moment so it’s a very uncertain scenario.”
The annual review also celebrated other “surprises, successes and joyful moments” along the coast, including:
- Unprecedented numbers of grey seals seen in one northern region.
- Peak numbers of puffins on a Welsh island.
- A first-ever sighting of an unusual mollusc in Yorkshire, usually found in the south-west.
- A variable blenny discovered off the coast of Sussex for the inaugural time.
A Note of Caution
Challenges were also present, however. “The year was bookended by environmental disasters,” noted a conservation leader. “A major tanker collision in the North Sea and a spill of plastic pollution off the Sussex coast highlighted ongoing threats. Conservation teams are working tirelessly to protect and restore our marine habitats.”
