2025 Declared The Year for Octopuses Off Britain's South Coast.
Unprecedented observations of one of the world's most intelligent invertebrates this past summer have resulted in the declaration of 2025 as the octopus's year in a seasonal assessment of the nation's marine environment.
A Perfect Storm Driving a Surge
A gentle winter and then a very warm springtime prompted a huge population of Mediterranean octopuses to settle along England’s south coast, spanning the Cornish and Devonian coasts.
“The reported landings was approximately 13 times what we would typically see in the waters around Cornwall,” stated a marine life specialist. “When we added up the numbers, nearly a quarter of a million octopuses were found in these waters this year – representing a massive jump from historical averages.”
The Mediterranean octopus is found in British seas but ordinarily in such small numbers it is rarely seen. A population bloom is attributed to a combination of gentle winter conditions and a warm breeding season. This perfect scenario meant a higher survival rate for young, possibly in part fuelled by significant populations of a favored prey species noted in recent years.
A Rare Phenomenon
Previously, such an octopus proliferation comparable was recorded in 1950, with archival data indicating the last bloom prior to that was in the turn of the 20th century.
The sheer quantity of octopuses meant they could be frequently seen in coastal areas for a rare occurrence. Video footage show octopuses gathering in groups – they are usually solitary – and ambulating along the ocean floor on the tips of their limbs. A curious octopus was even filmed grabbing a diver's camera.
“The first time I dived there this year I saw five octopuses,” they noted. “They are large specimens. We have two species in UK waters. The curled octopus is smaller, about the size of a football, but these common octopuses can be up to a metre and a half wide.”
Predictions and Marine Joy
If conditions remain mild going into 2026 meant it was possible a second bloom in 2026, because based on records, with such patterns, events have occurred consecutively for two years in a row.
“Still, the chances are low, based on past events, that it will go on for a long time,” they stated. “The ocean is full of surprises currently so it’s hard to forecast.”
The assessment also highlighted other “surprises, successes and joyful moments” along the coast, including:
- A record number of gray seals observed in one northern region.
- Exceptional populations of puffins on a Welsh island.
- The first recording of a rare sea slug in Yorkshire, normally residing farther south.
- A type of blenny found off the coast of a southern county for the first time.
Environmental Concerns
Challenges were also present, however. “The year was bookended by marine incidents,” said a head of marine conservation. “A major tanker collision in March and the release of industrial pellets off the Sussex coast served as stark reminders. Staff and volunteers are making huge efforts to protect and restore our marine habitats.”
