2025 Hailed as the 'Year of the Octopus' Off England's Southern Shores.
Record-breaking sightings of one of the world's most intelligent invertebrates during the summer season have resulted in the declaration of 2025 as the octopus's year in an annual review of Britain’s seas.
A Perfect Storm Leading to an Explosion
A gentle winter coupled with a very warm springtime prompted a massive influx of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was roughly 13 times what we would normally expect in Cornish waters,” stated a marine life specialist. “Calculating the figures, around 233 thousand octopuses were caught in these waters this year – that’s a huge increase from what is typical.”
The Mediterranean octopus is native to British seas but ordinarily in such small numbers it is rarely seen. A sudden increase is caused by the dual effect of a mild winter and favorable spring temperatures. This perfect scenario meant a higher survival rate for young, maybe aided by abundant stocks of other marine life also recorded.
A Rare Phenomenon
Previously, such an octopus proliferation this significant was recorded in the mid-20th century, with archival data indicating the last bloom prior to that was in 1900.
The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Underwater recordings show octopuses congregating together – unlike their typical solitary behavior – and moving along the ocean floor on the tips of their limbs. A curious octopus was even recorded reaching for submarine recording equipment.
“The first time I dived in that area this year I saw five of these creatures,” the specialist continued. “They are sizeable. We have two species in the region. The curled octopus is rather small, football-sized, but these common octopuses can be with a span of 1.5 meters.”
Predictions and Marine Joy
Another mild winter going into 2026 meant it was possible a second bloom in 2026, because based on records, with such patterns, the blooms have repeated for two years running.
“However, it is unlikely, from previous blooms, that it will go on for a long time,” they cautioned. “The ocean is full of surprises these days so it’s quite an unpredictable situation.”
The report also celebrated additional positive marine news around the UK coastline, including:
- A record number of gray seals recorded in one northern region.
- Peak numbers of the iconic seabirds on a Welsh island.
- The initial discovery of an unusual mollusc in a northern county, usually found in the south-west.
- A Mediterranean fish species found off the coast of a southern county for the inaugural time.
Not All Positive News
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 tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Dedicated individuals are making huge efforts to defend and heal our shorelines.”