2025 Declared the 'Year of the Octopus' Off Britain's Southern Shores.
Exceptionally high observations of a supremely intelligent sea creature this past summer have led to the naming of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.
A Perfect Storm Driving a Surge
A gentle winter and then a remarkably hot spring prompted a massive influx of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, across the southwestern peninsula.
“The volume of octopuses caught was approximately 13 times what we would usually anticipate in the waters around Cornwall,” commented a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were caught in these waters this year – representing a massive jump from what is typical.”
*Octopus vulgaris* is native to British seas but usually so scarce it is seldom observed. A sudden increase is the result of the dual effect of gentle winter conditions and a warm breeding season. This perfect scenario meant more larvae, maybe aided by abundant stocks of a favored prey species noted in recent years.
An Uncommon Occurrence
Previously, a population surge of this scale comparable was documented in the 1950s, with past documentation indicating the previous major event occurred in the turn of the 20th century.
The sheer quantity of octopuses meant they could be easily spotted in shallow waters for the first time in recent history. Video footage show octopuses congregating together – contrary to their normally lone nature – and ambulating along the seabed on their tentacle tips. One individual was even filmed grabbing a diver's camera.
“The first time I dived there this year I saw multiple octopuses,” the specialist continued. “And these are big. There are two types 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
Another mild winter going into 2026 could lead to another surge the following year, because based on records, in similar situations, populations have surged again for two years running.
“However, it is unlikely, based on past events, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises currently so it’s quite an unpredictable situation.”
The assessment also celebrated additional positive marine news along the coast, including:
- Highest-ever counts of grey seals observed in one northern region.
- Record numbers of the iconic seabirds on an island off Wales.
- The first recording of a rare sea slug in Yorkshire, typically a southwestern species.
- A variable blenny spotted off the coast of a southern county for the first time.
Not All Positive News
Not everything was good news, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and the release of tonnes of plastic biobeads off the Sussex coast highlighted ongoing threats. Staff and volunteers are making huge efforts to defend and heal our coasts.”
