2025 Hailed as The Year for Octopuses Off England's South Coast.

Exceptionally high encounters of one of the world's most intelligent invertebrates over the summer months have resulted in the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter and then an exceptionally warm spring prompted a massive influx of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, across the southwestern peninsula.

“The scale of the catch was of the order of about over a dozen times what we would usually anticipate in Cornish waters,” commented a marine conservation officer. “When we added up the numbers, around 233 thousand octopuses were found in UK waters this year – which is a significant rise from what is typical.”

The common octopus is found in British seas but usually so scarce 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, maybe aided by abundant stocks of a favored prey species seen in the area.

A Historic Event

The most recent occasion, a population surge of this scale of this size was observed in the 1950s, with historical records indicating the previous major event happened in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Diver videos show octopuses being sociable – they are usually solitary – and ambulating along the seabed on their arm ends. One creature was even filmed grabbing an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” they noted. “And these are big. There are two types in these waters. The curled octopus is smaller, about the size of a football, but the *Octopus vulgaris* 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 repeat event next year, because based on records, under these conditions, populations have surged again for two consecutive years.

“However, it is unlikely, based on past events, that it will persist indefinitely,” they stated. “The ocean is full of surprises currently so it’s a very uncertain scenario.”

The annual review also highlighted other “surprises, successes and joyful moments” around the UK coastline, including:

• A record number of grey seals seen in Cumbria.
• Peak numbers of puffins on an island off Wales.
• A first-ever sighting of a rare sea slug in Yorkshire, typically a southwestern species.
• A Mediterranean fish species spotted off the coast of a southern county for the first time.

Not All Positive News

The year had its low points, however. “The period was framed by environmental disasters,” noted a conservation leader. “A major tanker collision in the North Sea and an accidental discharge of industrial pellets off the southern coast served as stark reminders. Conservation teams are making huge efforts to defend and heal our coasts.”