2025 Hailed as 'The Octopus Year' Off England's Southern Shores.

Exceptionally high observations of a supremely intelligent sea creature this past summer have led to the naming of 2025 as the year for octopuses in a seasonal assessment of UK coastal waters.

A Perfect Storm for a Population Boom

A gentle winter and then a very warm springtime triggered unprecedented numbers of *Octopus vulgaris* to take up residence along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The volume of octopuses caught was of the order of about 13 times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “When we added up the numbers, around 233 thousand octopuses were found in these waters this year – representing a massive jump from historical averages.”

The Mediterranean octopus is indigenous to British seas but typically so rare it is rarely seen. An explosive growth is attributed to a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant more larvae, potentially supported by large numbers of a favored prey species also recorded.

An Uncommon Occurrence

The most recent occasion, an octopus bloom this significant was observed in the mid-20th century, with past documentation indicating the previous major event happened in 1900.

The sheer quantity of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Video footage show octopuses being sociable – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One creature was even filmed grabbing an underwater camera.

“On my initial dive in that area this year I saw five octopuses,” the specialist continued. “And these are big. There are two types 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.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 meant it was possible another surge next year, because in the past, under these conditions, populations have surged again for two years in a row.

“Still, the chances are low, from previous blooms, that it will persist indefinitely,” they stated. “But the sea keeps giving us surprises at the moment so it’s hard to forecast.”

The assessment also noted further encouraging coastal sightings around the UK coastline, including:

• A record number of grey seals recorded in one northern region.
• Peak numbers of puffins on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A variable blenny spotted off the coast of Sussex for the first time.

A Note of Caution

Not everything was good news, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and the release of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Dedicated individuals are making huge efforts to safeguard and rehabilitate our coasts.”