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

Exceptionally high sightings of one of the world's most intelligent invertebrates this past summer have prompted the naming of 2025 as the year for octopuses in a yearly report of Britain’s seas.

A Perfect Storm Driving a Surge

A mild winter followed by a remarkably hot spring catalyzed a massive influx of common octopuses (*Octopus vulgaris*) to take up residence 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 typically see in the waters around Cornwall,” commented a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were found in UK waters this year – which is a significant rise from historical averages.”

*Octopus vulgaris* is found in UK waters but ordinarily in such small numbers it is seldom observed. A sudden increase is caused by a combination of gentle winter conditions and a warm breeding season. This perfect scenario meant increased juvenile survival, maybe aided by abundant stocks of spider crabs seen in the area.

A Rare Phenomenon

Previously, such an octopus proliferation of this size was observed in the mid-20th century, with historical records indicating the last bloom prior to that was in 1900.

The sheer quantity of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Diver videos show octopuses being sociable – they are usually solitary – and “walking” along the seabed on their arm ends. One creature was even recorded reaching for an underwater camera.

“During a first dive in that area this year I saw five of these creatures,” the specialist continued. “And these are big. Two kinds exist in these waters. One species is smaller, the size of a ball, but these newcomers can be up to a metre and a half wide.”

Predictions and Marine Joy

If conditions remain mild this coming winter meant it was possible a second bloom the following year, because based on records, in similar situations, populations have surged again for two consecutive years.

“Still, the chances are low, based on past events, that it will become a permanent fixture,” they stated. “Marine life is unpredictable these days so it’s a very uncertain scenario.”

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

• A record number of grey seals recorded in one northern region.
• Record numbers of the iconic seabirds on Skomer.
• The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
• A variable blenny found 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,” stated an expert. “A major tanker collision in the North Sea and a spill of tonnes of plastic biobeads off the southern coast were serious issues. Staff and volunteers are putting in immense work to safeguard and rehabilitate our coasts.”