2025 Declared 'The Octopus Year' Along England's South Coast.

Record-breaking observations of a supremely intelligent sea creature during the summer season have resulted in the naming of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.

A Perfect Storm Leading to an Explosion

A gentle winter followed by a remarkably hot spring catalyzed a huge population of Mediterranean octopuses to take up residence along the southern coastline of England, across the southwestern peninsula.

“The scale of the catch was approximately over a dozen times what we would typically see in the waters around Cornwall,” stated an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were found in UK waters this year – that’s a huge increase from what is typical.”

*Octopus vulgaris* is native to UK waters but ordinarily in such small numbers it is rarely seen. A sudden increase is caused by a combination of gentle winter conditions and a warm breeding season. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of spider crabs seen in the area.

An Uncommon Occurrence

The most recent occasion, an octopus bloom of this size was observed in the 1950s, with past documentation indicating the previous major event was in the turn of the 20th century.

The sheer quantity of octopuses meant they could be readily observed in nearshore environments for a rare occurrence. Video footage show octopuses congregating together – they are usually solitary – and ambulating along the bottom on the tips of their limbs. One individual was even seen investigating a diver's camera.

“The first time I dived in that area this year I saw multiple octopuses,” they noted. “They are sizeable. We have two species in these waters. One species is smaller, the size of a ball, but these newcomers can be with a span of 1.5 meters.”

Predictions and Marine Joy

Another mild winter going into 2026 meant it was possible a repeat event the following year, because in the past, in similar situations, events have occurred consecutively for two years in a row.

“But, it's improbable, based on past events, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”

The report also celebrated other “surprises, successes and joyful moments” along the coast, including:

• Unprecedented numbers of grey seals recorded in one northern region.
• Record numbers of the iconic seabirds on Skomer.
• The first recording of an unusual mollusc in a northern county, normally residing farther south.
• A Mediterranean fish species found off the coast of Sussex for the first occasion.

A Note of Caution

Challenges were also present, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A major tanker collision in March and a spill of industrial pellets off the southern coast were serious issues. Staff and volunteers are making huge efforts to protect and restore our coasts.”