2025 Declared the 'Year of the Octopus' Along Britain's South Coast.

Unprecedented sightings of a supremely intelligent sea creature over the summer months have led to the declaration of 2025 as “the year of the octopus” in an annual review of UK coastal waters.

Ideal Conditions Driving a Surge

A gentle winter followed by a remarkably hot spring prompted a huge population of *Octopus vulgaris* to establish themselves along England’s south coast, across the southwestern peninsula.

“The volume of octopuses caught was approximately thirteen times what we would usually anticipate in Cornish waters,” stated a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – that’s a huge increase from historical averages.”

*Octopus vulgaris* is found in UK waters but typically so rare it is infrequently encountered. An explosive growth is the result of the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, maybe aided by large numbers of spider crabs also recorded.

An Uncommon Occurrence

The last time, such an octopus proliferation this significant was observed in 1950, with past documentation indicating the one before that happened in 1900.

The remarkable abundance of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even filmed grabbing a diver's camera.

“On my initial dive in that area this year I saw multiple octopuses,” the specialist continued. “They are sizeable. We have two species in UK waters. The curled octopus is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 could lead to another surge in 2026, because based on records, in similar situations, populations have surged again for two years in a row.

“However, it is unlikely, looking at history, that it will go on for a long time,” they stated. “Marine life is unpredictable currently so it’s quite an unpredictable situation.”

The annual review also noted other “surprises, successes and joyful moments” along the coast, including:

• Highest-ever counts of gray seals observed in one northern region.
• Exceptional populations of puffins on Skomer.
• A first-ever sighting of an unusual mollusc in Yorkshire, usually found in the south-west.
• A Mediterranean fish species discovered off the coast of a southern county for the first occasion.

Environmental Concerns

Challenges were also present, however. “The calendar year was marked by environmental disasters,” stated an expert. “A major tanker collision in the North Sea and a spill of plastic pollution off the Sussex coast were serious issues. Conservation teams are making huge efforts to protect and restore our coasts.”