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

Record-breaking sightings of a remarkably clever cephalopod during the summer season have resulted in the naming of 2025 as the year for octopuses in a yearly report of Britain’s seas.

A Perfect Storm Driving a Surge

A mild winter and then an exceptionally warm spring catalyzed a massive influx of Mediterranean octopuses to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was approximately 13 times what we would typically see in Cornish waters,” explained a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – which is a significant rise from what is typical.”

*Octopus vulgaris* is indigenous to British seas but typically so rare it is infrequently encountered. A sudden increase is caused by a combination of a mild winter and a warm breeding season. Such favorable circumstances meant a higher survival rate for young, potentially supported by significant populations of a favored prey species seen in the area.

An Uncommon Occurrence

Previously, an octopus bloom of this size was documented in the 1950s, with historical records indicating the last bloom prior to that happened in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Diver videos show octopuses gathering in groups – contrary to their normally lone nature – and ambulating along the ocean floor on the tips of their limbs. A curious octopus was even filmed grabbing an underwater camera.

“On my initial dive there this year I saw five octopuses,” they noted. “They are large specimens. Two kinds exist in the region. The curled octopus is smaller, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”

Future Prospects and Other Surprises

Another mild winter heading into next year meant it was possible a second bloom in 2026, because based on records, under these conditions, events have occurred consecutively for two consecutive years.

“However, it is unlikely, from previous blooms, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises currently so it’s hard to forecast.”

The annual review also celebrated further encouraging coastal sightings across British shores, including:

• Unprecedented numbers of grey seals recorded in Cumbria.
• Peak numbers of puffins on an island off Wales.
• The first recording of the *Capellinia fustifera* nudibranch in a northern county, usually found in the south-west.
• A Mediterranean fish species discovered off the coast of a southern county for the first occasion.

A Note of Caution

Not everything was good news, however. “The calendar year was marked by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and a spill of industrial pellets off the Sussex coast served as stark reminders. Conservation teams are working tirelessly to protect and restore our marine habitats.”