2025 Proclaimed The Year for Octopuses Along England's South Coast.
Record-breaking encounters of a supremely intelligent sea creature over the summer months have resulted in the naming of 2025 as the year for octopuses in a seasonal assessment of UK coastal waters.
A Confluence of Factors Driving a Surge
A mild winter followed by an exceptionally warm spring triggered a huge population of Mediterranean octopuses to take up residence along the southern coastline of England, spanning the Cornish and Devonian coasts.
“The volume of octopuses caught was of the order of about over a dozen times what we would usually anticipate in Cornish waters,” stated a marine life specialist. “When we added up the numbers, nearly a quarter of a million octopuses were present in British seas this year – which is a significant rise from historical averages.”
*Octopus vulgaris* is native to these waters but typically so rare it is infrequently encountered. An explosive growth is attributed to the dual effect of a mild winter and a warm breeding season. These ideal conditions meant more larvae, potentially supported by abundant stocks of spider crabs also recorded.
A Rare Phenomenon
Previously, such an octopus proliferation of this size was observed in 1950, with past documentation indicating the last bloom prior to that happened in the turn of the 20th century.
The sheer quantity of octopuses meant they could be frequently seen in nearshore environments for a rare occurrence. Diver videos show octopuses congregating together – unlike their typical solitary behavior – and ambulating along the ocean floor on their arm ends. One individual was even seen investigating submarine recording equipment.
“The first time I dived in that area this year I saw five octopuses,” the officer added. “They are large specimens. There are two types in UK waters. The curled octopus is rather small, the size of a ball, but these newcomers can be with a span of 1.5 meters.”
Predictions and Marine Joy
A second gentle winter going into 2026 could lead to a second bloom next year, because in the past, in similar situations, populations have surged again for two years in a row.
“But, it's improbable, looking at history, that it will go on for a long time,” they said. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”
The report also highlighted other “surprises, successes and joyful moments” along the coast, including:
- Highest-ever counts of gray seals recorded in one northern region.
- Exceptional populations of the iconic seabirds 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.
Not All Positive News
The year had its low points, however. “The calendar year was marked by ecological challenges,” stated an expert. “A significant shipping incident in March and the release of plastic pollution off the southern coast were serious issues. Conservation teams are making huge efforts to protect and restore our coasts.”