2025 Hailed as The Year for Octopuses Along England's South Coast.

Record-breaking observations of one of the world's most intelligent invertebrates this past summer have led to the naming of 2025 as the year for octopuses in a yearly report of Britain’s seas.

A Perfect Storm Leading to an Explosion

A gentle winter and then a remarkably hot spring triggered unprecedented numbers of common octopuses (*Octopus vulgaris*) to settle along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was roughly thirteen times what we would usually anticipate in the waters around Cornwall,” commented a marine conservation officer. “Based on the totals, around 233 thousand octopuses were found in these waters this year – which is a significant rise from the norm.”

The common octopus is native to UK waters but usually so scarce it is rarely seen. A sudden increase is attributed to a combination of a mild winter and a warm breeding season. This perfect scenario meant increased juvenile survival, possibly in part fuelled by significant populations of spider crabs seen in the area.

An Uncommon Occurrence

Previously, such an octopus proliferation comparable was observed in the mid-20th century, with historical records indicating the last bloom prior to that was in 1900.

The remarkable abundance of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Video footage show octopuses being sociable – they are usually solitary – and ambulating along the seabed on their tentacle tips. One individual was even seen investigating an underwater camera.

“On my initial dive off the Lizard peninsula this year I saw multiple octopuses,” the officer added. “They are sizeable. Two kinds exist in these waters. The curled octopus is rather small, the size of a ball, but these newcomers can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

A second gentle winter heading into next year meant it was possible a repeat event next year, because historically, with such patterns, events have occurred consecutively for two years running.

“But, it's improbable, from previous blooms, that it will become a permanent fixture,” they said. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.”

The annual review also noted additional positive marine news across British shores, including:

• Unprecedented numbers of gray seals seen in one northern region.
• Exceptional populations of puffins on Skomer.
• The initial discovery of a rare sea slug in Yorkshire, typically a southwestern species.
• A variable blenny spotted off the coast of a southern county for the first time.

A Note of Caution

The year had its low points, however. “The period was framed by marine incidents,” said a head of marine conservation. “A significant shipping incident in March and the release of tonnes of plastic biobeads off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to protect and restore our marine habitats.”