2025 Proclaimed 'The Octopus Year' Along Britain's Southern Shores.

Record-breaking observations of a remarkably clever cephalopod during the summer season have led to the declaration of 2025 as the octopus's year in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter followed by a remarkably hot spring catalyzed a massive influx of Mediterranean octopuses to establish themselves along the southern coastline of England, spanning the Cornish and Devonian coasts.

“The reported landings was of the order of about 13 times what we would usually anticipate in Cornish waters,” explained an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were caught in these waters this year – which is a significant rise from the norm.”

*Octopus vulgaris* is indigenous to these waters but ordinarily in such small numbers it is seldom observed. A sudden increase is the result of a combination of gentle winter conditions and a warm breeding season. Such favorable circumstances meant a higher survival rate for young, potentially supported by abundant stocks of spider crabs noted in recent years.

An Uncommon Occurrence

Previously, a population surge of this scale of this size was observed in the mid-20th century, with historical records indicating the previous major event was in 1900.

The huge numbers of octopuses meant they could be easily spotted in coastal areas for the first time in living memory. Underwater recordings show octopuses gathering in groups – unlike their typical solitary behavior – and ambulating along the ocean floor on the tips of their limbs. One individual was even filmed grabbing submarine recording equipment.

“During a first dive in that area this year I saw five octopuses,” they noted. “And these are big. There are two types in the region. The curled octopus is smaller, football-sized, but the *Octopus vulgaris* can be up to a metre and a half wide.”

Looking Ahead & Coastal Highlights

A second gentle winter this coming winter meant it was possible a second bloom next year, because in the past, in similar situations, populations have surged again for two consecutive years.

“Still, the chances are low, based on past events, that it will go on for a long time,” they said. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”

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

• A record number of grey seals observed in one northern region.
• Record numbers of puffins on Skomer.
• The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
• A type of blenny discovered off the coast of a southern county for the first occasion.

Environmental Concerns

The year had its low points, however. “The year was bookended by ecological challenges,” noted a conservation leader. “A major tanker collision in the North Sea and a spill of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to protect and restore our shorelines.”