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

Unprecedented observations of one of the world's most intelligent invertebrates over the summer months have resulted in the designation of 2025 as “the year of the octopus” in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter coupled with a remarkably hot spring prompted a huge population of common octopuses (*Octopus vulgaris*) to take up residence along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly thirteen times what we would usually anticipate in the waters around Cornwall,” stated an ocean conservation expert. “Calculating the figures, around 233 thousand octopuses were caught in UK waters this year – representing a massive jump from historical averages.”

The Mediterranean octopus is native to these waters but usually so scarce it is seldom observed. An explosive growth is attributed to the dual effect of a mild winter and favorable spring temperatures. These ideal conditions meant a higher survival rate for young, potentially supported by large numbers of a favored prey species noted in recent years.

A Historic Event

The most recent occasion, an octopus bloom of this size was recorded in 1950, with archival data indicating the previous major event was in the turn of the 20th century.

The sheer quantity of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Underwater recordings show octopuses congregating together – contrary to their normally lone nature – and moving along the bottom on their tentacle tips. One creature was even seen investigating submarine recording equipment.

“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 the region. The curled octopus is quite small, the size of a ball, but these newcomers can be with a span of 1.5 meters.”

Predictions and Marine Joy

If conditions remain mild heading into next year could lead to a second bloom in 2026, because based on records, in similar situations, events have occurred consecutively for two years running.

“Still, the chances are low, looking at history, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

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

• Unprecedented numbers of grey seals seen in one northern region.
• Record numbers of the iconic seabirds on an island off Wales.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
• A variable blenny spotted off the coast of a southern county for the first time.

Not All Positive News

Not everything was good news, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of industrial pellets off the southern coast were serious issues. Staff and volunteers are putting in immense work to defend and heal our coasts.”