2025 Hailed as the 'Year of the Octopus' Along Britain's Southern Shores.
Exceptionally high observations of a supremely intelligent sea creature during the summer season have resulted in the declaration of 2025 as “the year of the octopus” in a seasonal assessment of Britain’s seas.
A Perfect Storm for a Population Boom
A gentle winter and then a very warm springtime prompted a huge population of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.
“The scale of the catch was approximately thirteen times what we would typically see in Cornish waters,” commented an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were caught in UK waters this year – which is a significant rise from the norm.”
The Mediterranean octopus is native to British seas but ordinarily in such small numbers it is seldom observed. A sudden increase is caused by a combination of gentle winter conditions and favorable spring temperatures. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs seen in the area.
A Rare Phenomenon
The most recent occasion, a population surge of this scale this significant was recorded in the 1950s, with historical records indicating the last bloom prior to that occurred in 1900.
The huge numbers of octopuses meant they could be easily spotted in nearshore environments 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 the tips of their limbs. One creature was even seen investigating submarine recording equipment.
“On my initial dive in that area this year I saw five of these creatures,” they noted. “And these are big. There are two types in the region. The curled octopus is smaller, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”
Predictions and Marine Joy
A second gentle winter going into 2026 suggests the potential a repeat event the following year, because in the past, with such patterns, the blooms have repeated for two years in a row.
“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they stated. “But the sea keeps giving us surprises these days so it’s a very uncertain scenario.”
The report also highlighted other “surprises, successes and joyful moments” along the coast, including:
- A record number of grey seals observed in Cumbria.
- Peak numbers of the iconic seabirds on a Welsh island.
- The initial discovery of an unusual mollusc in a northern county, usually found in the south-west.
- A variable blenny found off the coast of Sussex for the first occasion.
A Note of Caution
Not everything was good news, however. “The calendar year was marked by marine incidents,” noted a conservation leader. “A significant shipping incident in March and a spill of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Conservation teams are putting in immense work to safeguard and rehabilitate our marine habitats.”