2025 Declared the 'Year of the Octopus' Off England's South Coast.
Unprecedented sightings of one of the world's most intelligent invertebrates this past summer have resulted in the designation of 2025 as the octopus's year in a yearly report of Britain’s seas.
Ideal Conditions Driving a Surge
An unusually warm winter and then an exceptionally warm spring prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula.
“The scale of the catch was roughly 13 times what we would usually anticipate in this region,” commented an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were present in these waters this year – which is a significant rise from historical averages.”
*Octopus vulgaris* is indigenous to British seas but usually so scarce it is seldom observed. A sudden increase is the result of a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant more larvae, maybe aided by significant populations of other marine life also recorded.
A Rare Phenomenon
The last time, a population surge of this scale comparable was recorded in the mid-20th century, with archival data indicating the last bloom prior to that happened in 1900.
The huge numbers of octopuses meant they could be frequently seen in coastal areas for the first time in recent history. Video footage show octopuses being sociable – they are usually solitary – and moving along the bottom on their tentacle tips. A curious octopus was even recorded reaching for an underwater camera.
“The first time I dived there this year I saw multiple octopuses,” the officer added. “They are large specimens. We have two species in these waters. The curled octopus is smaller, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
If conditions remain mild going into 2026 meant it was possible a second bloom next year, because in the past, under these conditions, events have occurred consecutively for two consecutive years.
“But, it's improbable, looking at history, that it will go on for a long time,” they cautioned. “Marine life is unpredictable at the moment so it’s a very uncertain scenario.”
The report also highlighted further encouraging coastal sightings along the coast, including:
- Highest-ever counts of gray seals observed in one northern region.
- Record numbers of puffins on Skomer.
- The first recording of an unusual mollusc in Yorkshire, usually found in the south-west.
- A type of blenny found off the coast of Sussex for the inaugural time.
Not All Positive News
Not everything was good news, however. “The period was framed by ecological challenges,” noted a conservation leader. “A significant shipping incident in the North Sea and a spill of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Dedicated individuals are putting in immense work to defend and heal our coasts.”
