2025 Declared The Year for Octopuses Off Britain's Southern Shores.
Unprecedented sightings of one of the world's most intelligent invertebrates during the summer season have led to the declaration of 2025 as “the year of the octopus” in a yearly report of UK coastal waters.
A Perfect Storm for a Population Boom
A mild winter and then an exceptionally warm spring triggered a huge population of Mediterranean octopuses to settle along England’s south coast, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was of the order of about thirteen times what we would normally expect in this region,” commented an ocean conservation expert. “Based on the totals, approximately 233,000 octopuses were found in British seas this year – that’s a huge increase from what is typical.”
The common octopus is found in these waters but typically so rare it is seldom observed. An explosive growth is caused by the dual effect of gentle winter conditions and a warm breeding season. These ideal conditions meant a higher survival rate for young, maybe aided by large numbers of spider crabs seen in the area.
A Historic Event
The most recent occasion, a population surge of this scale this significant was recorded in the mid-20th century, with past documentation indicating the previous major event happened in 1900.
The sheer quantity of octopuses meant they could be readily observed in coastal areas for the first time in recent history. Underwater recordings show octopuses being sociable – they are usually solitary – and “walking” along the ocean floor on their tentacle tips. One creature 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 quite small, the size of a ball, but these newcomers can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
Another mild winter this coming winter could lead to a second bloom next year, because in the past, with such patterns, populations have surged again for two consecutive years.
“However, it is unlikely, based on past events, that it will persist indefinitely,” they stated. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”
The assessment also celebrated other “surprises, successes and joyful moments” along the coast, including:
- Unprecedented numbers of gray seals recorded in Cumbria.
- Peak numbers of the iconic seabirds on a Welsh island.
- The initial discovery of a rare sea slug in a northern county, usually found in the south-west.
- A variable blenny spotted off the coast of a southern county for the first time.
Environmental Concerns
The year had its low points, however. “The year was bookended by ecological challenges,” stated an expert. “A major tanker collision in the North Sea and a spill of industrial pellets off the southern coast highlighted ongoing threats. Dedicated individuals are making huge efforts to protect and restore our shorelines.”
