2025 Hailed as the 'Year of the Octopus' Off England's Southern Shores.

Unprecedented sightings of a remarkably clever cephalopod over the summer months have led to the naming of 2025 as the octopus's year in a yearly report of the nation's marine environment.

Ideal Conditions Driving a Surge

A gentle winter and then a very warm springtime catalyzed a huge population of Mediterranean octopuses to settle along England’s south coast, across the southwestern peninsula.

“The reported landings was roughly 13 times what we would normally expect in Cornish waters,” stated an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were present in UK waters this year – which is a significant rise from historical averages.”

The common octopus is found in these waters but usually so scarce it is seldom observed. An explosive growth is the result of a combination of a mild winter and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by large numbers of spider crabs also recorded.

An Uncommon Occurrence

Previously, an octopus bloom this significant was recorded in 1950, with historical records indicating the previous major event occurred in 1900.

The huge numbers of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Diver videos show octopuses gathering in groups – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even filmed grabbing an underwater camera.

“During a first dive there this year I saw multiple octopuses,” they noted. “They are sizeable. We have two species in UK waters. One species is smaller, the size of a ball, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Future Prospects and Other Surprises

If conditions remain mild this coming winter meant it was possible another surge the following year, because based on records, in similar situations, events have occurred consecutively for two years running.

“But, it's improbable, looking at history, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises these days so it’s a very uncertain scenario.”

The report also highlighted additional positive marine news around the UK coastline, including:

• Unprecedented numbers of grey seals recorded in Cumbria.
• Record numbers of the iconic seabirds on an island off Wales.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A variable blenny discovered off the coast of a southern county for the inaugural time.

A Note of Caution

Challenges were also present, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of plastic pollution off the southern coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our marine habitats.”