2025 Declared The Year for Octopuses Along England's Southern Shores.

Record-breaking observations of a supremely intelligent sea creature over the summer months have prompted the naming of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.

A Perfect Storm for a Population Boom

A mild winter and then an exceptionally warm spring catalyzed a massive influx of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was roughly over a dozen times what we would typically see in Cornish waters,” commented an ocean conservation expert. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – which is a significant rise from historical averages.”

The common octopus is found in these waters but usually so scarce it is infrequently encountered. A population bloom is caused by the dual effect of gentle winter conditions and a warm breeding season. This perfect scenario meant a higher survival rate for young, maybe aided by large numbers of spider crabs noted in recent years.

An Uncommon Occurrence

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

The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Underwater recordings show octopuses being sociable – contrary to their normally lone nature – and moving along the ocean floor on their arm ends. A curious octopus was even seen investigating a diver's camera.

“On my initial dive in that area this year I saw multiple octopuses,” the officer added. “And these are big. There are two types in the region. The curled octopus is rather small, 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 could lead to a second bloom next year, because in the past, in similar situations, events have occurred consecutively for two years in a row.

“But, it's improbable, looking at history, that it will go on for a long time,” they cautioned. “Marine life is unpredictable these days so it’s hard to forecast.”

The annual review also celebrated additional positive marine news around the UK coastline, including:

• A record number of grey seals recorded in one northern region.
• Record numbers of the iconic seabirds on a Welsh island.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A Mediterranean fish species spotted off the coast of Sussex for the first time.

A Note of Caution

Challenges were also present, however. “The calendar year was marked by ecological challenges,” stated an expert. “A significant shipping incident in March and a spill of tonnes of plastic biobeads off the southern coast served as stark reminders. Conservation teams are working tirelessly to protect and restore our shorelines.”