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

Unprecedented observations of a remarkably clever cephalopod during the summer season have resulted in the naming of 2025 as the octopus's year in a seasonal assessment of UK coastal waters.

A Perfect Storm for a Population Boom

An unusually warm winter and then an exceptionally warm spring triggered unprecedented numbers of Mediterranean octopuses to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The scale of the catch was approximately 13 times what we would usually anticipate in the waters around Cornwall,” explained an ocean conservation expert. “Calculating the figures, around 233 thousand octopuses were present in UK waters this year – which is a significant rise from the norm.”

*Octopus vulgaris* is indigenous to UK waters but typically so rare it is infrequently encountered. A population bloom is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, possibly in part fuelled by large numbers of spider crabs noted in recent years.

An Uncommon Occurrence

Previously, a population surge of this scale comparable was observed in the mid-20th century, with historical records indicating the previous major event happened in the turn of the 20th century.

The huge numbers of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Diver videos show octopuses being sociable – contrary to their normally lone nature – and moving along the bottom on the tips of their limbs. One creature was even filmed grabbing submarine recording equipment.

“During a first dive in that area this year I saw multiple octopuses,” the officer added. “They are large specimens. There are two types in these waters. One species is quite small, about the size of a football, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

If conditions remain mild heading into next year meant it was possible a repeat event next year, because historically, in similar situations, events have occurred consecutively for two years in a row.

“But, it's improbable, looking at history, that it will persist indefinitely,” they cautioned. “The ocean is full of surprises currently so it’s a very uncertain scenario.”

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

• A record number of gray seals observed in Cumbria.
• Record numbers of the iconic seabirds on a Welsh island.
• The initial discovery of an unusual mollusc in a northern county, usually found in the south-west.
• A Mediterranean fish species spotted off the coast of a southern county for the inaugural time.

A Note of Caution

The year had its low points, however. “The year was bookended by ecological challenges,” noted a conservation leader. “A significant shipping incident in the North Sea and a spill of industrial pellets off the Sussex coast highlighted ongoing threats. Conservation teams are working tirelessly to safeguard and rehabilitate our coasts.”