2025 Declared The Year for Octopuses Off England's Southern Shores.
Exceptionally high encounters of one of the world's most intelligent invertebrates during the summer season have prompted the declaration of 2025 as the octopus's year in an annual review of the nation's marine environment.
Ideal Conditions Driving a Surge
A mild winter followed by a very warm springtime catalyzed a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, across the southwestern peninsula.
“The reported landings was of the order of about thirteen times what we would normally expect in the waters around Cornwall,” stated a marine life specialist. “Based on the totals, approximately 233,000 octopuses were found in these waters this year – which is a significant rise from what is typical.”
The Mediterranean octopus is found in these waters but usually so scarce it is infrequently encountered. A sudden increase is caused by a combination of a mild winter and a warm breeding season. These ideal conditions meant more larvae, potentially supported by significant populations of other marine life noted in recent years.
A Rare Phenomenon
Previously, an octopus bloom this significant was recorded in 1950, with archival data indicating the last bloom prior to that occurred in the turn of the 20th century.
The huge numbers of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Video footage show octopuses congregating together – they are usually solitary – and “walking” along the seabed on their arm ends. One creature was even seen investigating submarine recording equipment.
“The first time I dived in that area this year I saw multiple octopuses,” they noted. “And these are big. We have two species in UK waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be up to a metre and a half wide.”
Predictions and Marine Joy
A second gentle winter going into 2026 suggests the potential a second bloom the following year, because historically, in similar situations, populations have surged again for two years running.
“However, it is unlikely, based on past events, that it will persist indefinitely,” they stated. “But the sea keeps giving us surprises currently so it’s quite an unpredictable situation.”
The annual review also celebrated additional positive marine news around the UK coastline, including:
- A record number of gray seals observed in Cumbria.
- Exceptional populations of the iconic seabirds on an island off Wales.
- The initial discovery of a rare sea slug in Yorkshire, usually found in the south-west.
- A type of blenny discovered off the coast of a southern county for the first time.
A Note of Caution
Challenges were also present, however. “The period was framed by environmental disasters,” stated an expert. “A major tanker collision in the North Sea and an accidental discharge of plastic pollution off the southern coast served as stark reminders. Dedicated individuals are putting in immense work to safeguard and rehabilitate our coasts.”