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

Exceptionally high observations of one of the world's most intelligent invertebrates over the summer months have led to the declaration of 2025 as the year for octopuses in a yearly report of Britain’s seas.

A Confluence of Factors Driving a Surge

A gentle winter coupled with an exceptionally warm spring catalyzed a massive influx of *Octopus vulgaris* to establish themselves along the shores from Cornwall to Devon, across the southwestern peninsula.

“The scale of the catch was approximately over a dozen times what we would usually anticipate in this region,” stated an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were present in UK waters this year – that’s a huge increase from the norm.”

The Mediterranean octopus is native to these waters but usually so scarce it is rarely seen. A population bloom is caused by the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant increased juvenile survival, maybe aided by large numbers of spider crabs noted in recent years.

A Rare Phenomenon

The most recent occasion, a population surge of this scale of this size was observed in 1950, with past documentation indicating the last bloom prior to that occurred in 1900.

The sheer quantity of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Diver videos show octopuses gathering in groups – they are usually solitary – and “walking” along the bottom on their tentacle tips. One creature was even seen investigating a diver's camera.

“During a first dive off the Lizard peninsula this year I saw five of these creatures,” the officer added. “They are large specimens. We have two species in these waters. The curled octopus is quite small, the size of a ball, but these newcomers can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

A second gentle winter going into 2026 could lead to a second bloom the following year, because based on records, in similar situations, the blooms have repeated for two years in a row.

“But, it's improbable, from previous blooms, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

The report also celebrated additional positive marine news along the coast, including:

• Highest-ever counts of grey seals observed in one northern region.
• Peak numbers of puffins on Skomer.
• The first recording of an unusual mollusc in a northern county, usually found in the south-west.
• A variable blenny spotted off the coast of Sussex for the first occasion.

Not All Positive News

Not everything was good news, however. “The year was bookended by ecological challenges,” noted a conservation leader. “A significant shipping incident in the North Sea and an accidental discharge of industrial pellets off the southern coast were serious issues. Dedicated individuals are making huge efforts to defend and heal our shorelines.”