2025 Hailed as The Year for Octopuses Along Britain's South Coast.

Exceptionally high sightings of one of the world's most intelligent invertebrates during the summer season have resulted in the designation of 2025 as “the year of the octopus” in a yearly report of the nation's marine environment.

A Perfect Storm for a Population Boom

A mild winter coupled with a very warm springtime prompted a massive influx of common octopuses (*Octopus vulgaris*) to establish themselves along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The reported landings was of the order of about thirteen times what we would usually anticipate in the waters around Cornwall,” stated an ocean conservation expert. “When we added up the numbers, approximately 233,000 octopuses were found in UK waters this year – representing a massive jump from what is typical.”

The common octopus is indigenous to these waters but usually so scarce it is infrequently encountered. A population bloom is attributed to a combination of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, potentially supported by significant populations of a favored prey species seen in the area.

A Historic Event

The most recent occasion, such an octopus proliferation of this size was recorded in the 1950s, with historical records indicating the last bloom prior to that was in 1900.

The huge numbers of octopuses meant they could be easily spotted in coastal areas for a rare occurrence. Underwater recordings show octopuses gathering in groups – unlike their typical solitary behavior – and moving along the seabed on their tentacle tips. One individual was even filmed grabbing submarine recording equipment.

“During a first dive off the Lizard peninsula this year I saw five octopuses,” they noted. “They are sizeable. Two kinds exist in the region. One species is smaller, about the size of a football, but these newcomers can be with a span of 1.5 meters.”

Predictions and Marine Joy

A second gentle winter going into 2026 meant it was possible a repeat event the following year, because in the past, with such patterns, populations have surged again for two consecutive years.

“However, it is unlikely, looking at history, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises these days so it’s a very uncertain scenario.”

The report also celebrated further encouraging coastal sightings along the coast, including:

• A record number of grey seals observed in one northern region.
• Peak numbers of the iconic seabirds on Skomer.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, typically a southwestern species.
• A type of blenny found off the coast of Sussex for the inaugural time.

Not All Positive News

Not everything was good news, however. “The period was framed by marine incidents,” stated an expert. “A significant shipping incident in March and the release of plastic pollution off the Sussex coast served as stark reminders. Conservation teams are putting in immense work to protect and restore our marine habitats.”