2025 Declared 'The Octopus Year' Off England's Southern Shores.

Unprecedented encounters of a supremely intelligent sea creature during the summer season have led to the naming of 2025 as the octopus's year in an annual review of UK coastal waters.

A Perfect Storm Driving a Surge

A gentle winter followed by a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The volume of octopuses caught was roughly thirteen times what we would normally expect in Cornish waters,” commented an ocean conservation expert. “When we added up the numbers, nearly a quarter of a million octopuses were caught in British seas this year – which is a significant rise from the norm.”

The Mediterranean octopus is found in UK waters but usually so scarce it is seldom observed. An explosive growth is the result of the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant increased juvenile survival, maybe aided by large numbers of other marine life also recorded.

A Historic Event

The last time, a population surge of this scale comparable was observed in the 1950s, with historical records indicating the previous major event was in the turn of the 20th century.

The sheer quantity of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and ambulating along the ocean floor on their arm ends. One creature was even filmed grabbing an underwater camera.

“During a first dive there this year I saw five of these creatures,” they noted. “They are sizeable. We have two species in the region. The curled octopus is rather small, about the size of a football, but these common octopuses can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

A second gentle winter heading into next year meant it was possible a second bloom next year, because in the past, in similar situations, populations have surged again for two years running.

“But, it's improbable, from previous blooms, that it will persist indefinitely,” they said. “The ocean is full of surprises at the moment so it’s a very uncertain scenario.”

The assessment also noted other “surprises, successes and joyful moments” around the UK coastline, including:

• Unprecedented numbers of gray seals seen in Cumbria.
• Record numbers of the iconic seabirds on Skomer.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A type of blenny spotted off the coast of a southern county for the inaugural time.

A Note of Caution

The year had its low points, however. “The period was framed by marine incidents,” noted a conservation leader. “A major tanker collision in the North Sea and a spill of industrial pellets off the Sussex coast served as stark reminders. Conservation teams are making huge efforts to safeguard and rehabilitate our coasts.”