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

Exceptionally high observations of a remarkably clever cephalopod during the summer season have prompted the naming of 2025 as “the year of the octopus” in an annual review of Britain’s seas.

A Perfect Storm Leading to an Explosion

An unusually warm winter coupled with a very warm springtime catalyzed a massive influx of Mediterranean octopuses to establish themselves along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The scale of the catch was of the order of about over a dozen times what we would usually anticipate in the waters around Cornwall,” explained a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were caught in UK waters this year – which is a significant rise from historical averages.”

The Mediterranean octopus is native to UK waters but typically so rare it is rarely seen. A sudden increase is the result of a combination of a mild winter and favorable spring temperatures. This perfect scenario meant more larvae, potentially supported by large numbers of spider crabs seen in the area.

A Historic Event

Previously, an octopus bloom comparable was observed in the 1950s, with archival data indicating the last bloom prior to that occurred in 1900.

The sheer quantity of octopuses meant they could be easily spotted in shallow waters for the first time in living memory. Diver videos show octopuses being sociable – they are usually solitary – and ambulating along the bottom on their tentacle tips. A curious octopus was even seen investigating a diver's camera.

“On my initial dive off the Lizard peninsula this year I saw five of these creatures,” the specialist continued. “They are large specimens. Two kinds exist in these waters. One species is quite small, the size of a ball, but these common octopuses can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter heading into next year suggests the potential another surge next year, because based on records, in similar situations, the blooms have repeated for two years in a row.

“However, it is unlikely, from previous blooms, that it will become a permanent fixture,” they stated. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”

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

• A record number of gray seals recorded in one northern region.
• Record numbers of the iconic seabirds on an island off Wales.
• A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
• A type of blenny found off the coast of Sussex for the inaugural time.

Not All Positive News

Not everything was good news, however. “The period was framed by environmental disasters,” noted a conservation leader. “A significant shipping incident in the North Sea and the release of plastic pollution off the Sussex coast served as stark reminders. Staff and volunteers are working tirelessly to protect and restore our shorelines.”