2025 Declared The Year for Octopuses Off Britain's Southern Shores.

Unprecedented encounters of one of the world's most intelligent invertebrates over the summer months have prompted the designation of 2025 as “the year of the octopus” in an annual review of the nation's marine environment.

Ideal Conditions Leading to an Explosion

A mild winter and then a remarkably hot spring prompted unprecedented numbers of *Octopus vulgaris* to settle along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The reported landings was approximately over a dozen times what we would typically see in this region,” commented an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were found in British seas this year – which is a significant rise 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, possibly in part fuelled by significant populations of spider crabs seen in the area.

A Rare Phenomenon

The last time, such an octopus proliferation of this size was recorded in 1950, with past documentation indicating the previous major event occurred in 1900.

The sheer quantity of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Diver videos show octopuses congregating together – they are usually solitary – and ambulating along the seabed on the tips of their limbs. A curious octopus was even seen investigating a diver's camera.

“During a first dive in that area this year I saw five of these creatures,” the officer added. “And these are big. There are two types in these waters. The curled octopus is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter this coming winter suggests the potential another surge the following year, because historically, under these conditions, populations have surged again for two years running.

“Still, the chances are low, looking at history, that it will go on for a long time,” they cautioned. “Marine life is unpredictable 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 initial discovery of a rare sea slug in Yorkshire, usually found in the south-west.
• A Mediterranean fish species found off the coast of a southern county for the first time.

Not All Positive News

Challenges were also present, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of plastic pollution off the Sussex coast served as stark reminders. Staff and volunteers are making huge efforts to protect and restore our shorelines.”