2025 Hailed as The Year for Octopuses Along Britain's Southern Shores.
Exceptionally high observations of a supremely intelligent sea creature over the summer months have prompted the naming of 2025 as the year for octopuses in an annual review of UK coastal waters.
Ideal Conditions for a Population Boom
An unusually warm winter and then an exceptionally warm spring triggered a huge population of *Octopus vulgaris* to settle along England’s south coast, across the southwestern peninsula.
“The volume of octopuses caught was of the order of about 13 times what we would normally expect in Cornish waters,” stated a marine life specialist. “When we added up the numbers, nearly a quarter of a million octopuses were present in these waters this year – representing a massive jump from historical averages.”
The Mediterranean octopus is indigenous to these waters but ordinarily in such small numbers it is infrequently encountered. A sudden increase is attributed to a combination of a mild winter and a warm breeding season. These ideal conditions meant increased juvenile survival, possibly in part fuelled by abundant stocks of spider crabs seen in the area.
A Rare Phenomenon
The last time, such an octopus proliferation comparable was observed in the 1950s, with historical records indicating the previous major event happened in 1900.
The huge numbers of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Video footage show octopuses being sociable – they are usually solitary – and ambulating along the bottom on their tentacle tips. One creature was even recorded reaching for an underwater camera.
“During a first dive in that area this year I saw multiple octopuses,” the specialist continued. “They are sizeable. There are two types in these waters. The curled octopus is quite small, about the size of a football, but these newcomers can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
Another mild winter heading into next year meant it was possible a repeat event in 2026, because historically, under these conditions, events have occurred consecutively for two consecutive years.
“However, it is unlikely, looking at history, that it will become a permanent fixture,” they said. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”
The assessment also noted other “surprises, successes and joyful moments” along the coast, including:
- Unprecedented numbers of grey seals seen in Cumbria.
- Exceptional populations of the iconic seabirds on Skomer.
- The first recording of an unusual mollusc in Yorkshire, typically a southwestern species.
- A Mediterranean fish species spotted off the coast of a southern county for the first occasion.
A Note of Caution
Challenges were also present, however. “The year was bookended by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of plastic pollution off the southern coast were serious issues. Conservation teams are working tirelessly to protect and restore our shorelines.”