2025 Proclaimed The Year for Octopuses Off England's Southern Shores.
Record-breaking encounters of a remarkably clever cephalopod this past summer have led to the designation of 2025 as the octopus's year in a seasonal assessment of Britain’s seas.
A Confluence of Factors for a Population Boom
A gentle winter and then an exceptionally warm spring prompted unprecedented numbers of Mediterranean octopuses to settle along the southern coastline of England, across the southwestern peninsula.
“The scale of the catch was of the order of about over a dozen times what we would usually anticipate in Cornish waters,” explained a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were present in UK waters this year – that’s a huge increase from historical averages.”
*Octopus vulgaris* is found in British seas but typically so rare it is infrequently encountered. A population bloom is caused by a combination of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, potentially supported by large numbers of a favored prey species noted in recent years.
A Historic Event
Previously, an octopus bloom comparable was observed in the 1950s, with historical records indicating the one before that was in the turn of the 20th century.
The huge numbers of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Video footage show octopuses being sociable – contrary to their normally lone nature – and “walking” along the ocean floor on the tips of their limbs. One creature was even recorded reaching for an underwater camera.
“The first time I dived there this year I saw five octopuses,” they noted. “They are sizeable. There are two types in the region. The curled octopus is smaller, about the size of a football, but these common octopuses can be with a span of 1.5 meters.”
Predictions and Marine Joy
Another mild winter heading into next year meant it was possible a second bloom in 2026, because in the past, in similar situations, events have occurred consecutively for two years in a row.
“Still, the chances are low, looking at history, that it will go on for a long time,” they cautioned. “Marine life is unpredictable these days so it’s quite an unpredictable situation.”
The annual review also highlighted additional positive marine news along the coast, including:
- Highest-ever counts of grey seals observed in one northern region.
- 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 Mediterranean fish species found off the coast of a southern county for the first time.
A Note of Caution
The year had its low points, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and the release of plastic pollution off the southern coast were serious issues. Conservation teams are making huge efforts to defend and heal our coasts.”
