2025 Proclaimed the 'Year of the Octopus' Along Britain's Southern Shores.

Exceptionally high sightings of one of the world's most intelligent invertebrates this past summer have resulted in the naming of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Perfect Storm Driving a Surge

A mild winter and then a very warm springtime triggered a massive influx of Mediterranean octopuses to settle along England’s south coast, from Penzance in Cornwall to south Devon.

“The reported landings was of the order of about over a dozen times what we would typically see in the waters around Cornwall,” explained a marine life specialist. “Calculating the figures, approximately 233,000 octopuses were caught in UK waters this year – representing a massive jump from what is typical.”

The common octopus is native to UK waters but typically so rare it is infrequently encountered. A population bloom is attributed to a combination of a mild winter and a warm breeding season. These ideal conditions meant a higher survival rate for young, potentially supported by large numbers of spider crabs seen in the area.

A Rare Phenomenon

The last time, an octopus bloom comparable was observed in 1950, with historical records indicating the one before that happened 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 congregating together – unlike their typical solitary behavior – and ambulating along the bottom on their arm ends. A curious octopus was even filmed grabbing a diver's camera.

“The first time I dived in that area this year I saw five of these creatures,” the officer added. “They are sizeable. There are two types in UK waters. The curled octopus is smaller, football-sized, but these common octopuses can be up to a metre and a half wide.”

Predictions and Marine Joy

Another mild winter heading into next year could lead to a repeat event the following year, because in the past, under these conditions, the blooms have repeated for two years in a row.

“But, it's improbable, based on past events, that it will go on for a long time,” they cautioned. “But the sea keeps giving us surprises these days so it’s a very uncertain scenario.”

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

• Highest-ever counts of gray seals seen in Cumbria.
• Exceptional populations of puffins on a Welsh island.
• The initial discovery of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
• A type of blenny discovered off the coast of Sussex for the first occasion.

Not All Positive News

The year had its low points, however. “The calendar year was marked by marine incidents,” noted a conservation leader. “A major tanker collision in the North Sea and an accidental discharge of plastic pollution off the Sussex coast highlighted ongoing threats. Staff and volunteers are putting in immense work to safeguard and rehabilitate our coasts.”