2025 Hailed as 'The Octopus Year' Off Britain's South Coast.
Exceptionally high sightings of a supremely intelligent sea creature during the summer season have led to the naming of 2025 as “the year of the octopus” in a yearly report of UK coastal waters.
A Confluence of Factors Leading to an Explosion
A gentle winter followed by an exceptionally warm spring prompted a huge population of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.
“The volume of octopuses caught was approximately 13 times what we would normally expect in Cornish waters,” stated a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were present in these waters this year – which is a significant rise from the norm.”
The Mediterranean octopus is native to British seas but usually so scarce it is rarely seen. A sudden increase is attributed to a combination of a mild winter and favorable spring temperatures. This perfect scenario meant more larvae, maybe aided by significant populations of other marine life seen in the area.
An Uncommon Occurrence
The most recent occasion, an octopus bloom of this size was observed in 1950, with historical records indicating the last bloom prior to that happened in 1900.
The huge numbers of octopuses meant they could be readily observed in shallow waters for a rare occurrence. Diver videos show octopuses being sociable – they are usually solitary – and “walking” along the seabed on their tentacle tips. One individual was even recorded reaching for a diver's camera.
“During a first dive there this year I saw five octopuses,” the officer added. “They are sizeable. Two kinds exist in the region. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”
Future Prospects and Other Surprises
If conditions remain mild heading into next year meant it was possible another surge in 2026, because historically, under these conditions, the blooms have repeated for two years in a row.
“But, it's improbable, looking at history, that it will go on for a long time,” they said. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”
The annual review also celebrated additional positive marine news along the coast, including:
- Unprecedented numbers of gray seals recorded in one northern region.
- Record numbers of the iconic seabirds on a Welsh island.
- The first recording of an unusual mollusc in Yorkshire, typically a southwestern species.
- A variable blenny found off the coast of a southern county for the first occasion.
Not All Positive News
The year had its low points, however. “The year was bookended by ecological challenges,” said a head of marine conservation. “A significant shipping incident in the North Sea and an accidental discharge of plastic pollution off the Sussex coast were serious issues. Dedicated individuals are putting in immense work to defend and heal our shorelines.”
