2025 Hailed as The Year for Octopuses Off Britain's Southern Shores.
Unprecedented encounters of one of the world's most intelligent invertebrates over the summer months have led to the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.
A Perfect Storm for a Population Boom
A mild winter coupled with a remarkably hot spring prompted a massive influx of Mediterranean octopuses to settle along the southern coastline of England, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was roughly 13 times what we would typically see in Cornish waters,” stated a marine life specialist. “Calculating the figures, approximately 233,000 octopuses were caught in British seas 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 population bloom is caused by a combination of a mild winter and a warm breeding season. Such favorable circumstances meant a higher survival rate for young, maybe aided by abundant stocks of a favored prey species also recorded.
An Uncommon Occurrence
The last time, an octopus bloom of this size was recorded in the 1950s, with past documentation indicating the previous major event occurred in 1900.
The remarkable abundance of octopuses meant they could be easily spotted in shallow waters for a rare occurrence. Video footage show octopuses congregating together – unlike their typical solitary behavior – and “walking” along the seabed on their tentacle tips. One creature was even seen investigating submarine recording equipment.
“During a first dive in that area this year I saw five of these creatures,” they noted. “And these are big. There are two types in these waters. The curled octopus is quite small, the size of a ball, but these newcomers can be with a span of 1.5 meters.”
Looking Ahead & Coastal Highlights
If conditions remain mild going into 2026 could lead to a second bloom the following year, because historically, in similar situations, populations have surged again for two years running.
“But, it's improbable, based on past events, that it will go on for a long time,” they said. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.”
The annual review also noted further encouraging coastal sightings across British shores, including:
- Unprecedented numbers of gray seals seen in one northern region.
- Peak numbers of the iconic seabirds on a Welsh island.
- The first recording of an unusual mollusc in a northern county, typically a southwestern species.
- A Mediterranean fish species spotted off the coast of a southern county for the first occasion.
A Note of Caution
Challenges were also present, however. “The year was bookended by ecological challenges,” stated an expert. “A significant shipping incident in the North Sea and an accidental discharge of industrial pellets off the Sussex coast highlighted ongoing threats. Dedicated individuals are making huge efforts to protect and restore our marine habitats.”
