2025 Declared the 'Year of the Octopus' Along England's Southern Shores.
Unprecedented sightings of a remarkably clever cephalopod during the summer season have led to the declaration of 2025 as the octopus's year in a yearly report of UK coastal waters.
A Confluence of Factors Leading to an Explosion
A mild winter coupled with a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to take up residence along England’s south coast, from Penzance in Cornwall to south Devon.
“The volume of octopuses caught was approximately thirteen times what we would normally expect in the waters around Cornwall,” explained a marine life specialist. “Based on the totals, approximately 233,000 octopuses were caught in UK waters this year – that’s a huge increase from historical averages.”
The Mediterranean octopus is indigenous to these waters but usually so scarce it is rarely seen. A sudden increase is the result of the dual effect of gentle winter conditions and a warm breeding season. These ideal conditions meant more larvae, potentially supported by abundant stocks of a favored prey species noted in recent years.
An Uncommon Occurrence
Previously, an octopus bloom this significant was recorded in the 1950s, with historical records indicating the one before that was in the turn of the 20th century.
The sheer quantity of octopuses meant they could be frequently seen in coastal areas for the first time in living memory. Underwater recordings show octopuses gathering in groups – they are usually solitary – and “walking” along the seabed on their tentacle tips. One individual was even seen investigating submarine recording equipment.
“During a first dive there this year I saw multiple octopuses,” the officer added. “And these are big. Two kinds exist in UK waters. One species is smaller, football-sized, but these newcomers can be with a span of 1.5 meters.”
Future Prospects and Other Surprises
If conditions remain mild going into 2026 meant it was possible a repeat event in 2026, because historically, in similar situations, the blooms have repeated for two consecutive years.
“However, it is unlikely, looking at history, that it will become a permanent fixture,” they cautioned. “Marine life is unpredictable these days so it’s hard to forecast.”
The annual review also highlighted other “surprises, successes and joyful moments” around the UK coastline, including:
- Highest-ever counts of gray seals recorded in one northern region.
- Record numbers of puffins on an island off Wales.
- A first-ever sighting of an unusual mollusc in a northern county, typically a southwestern species.
- A variable blenny found off the coast of Sussex for the first occasion.
Environmental Concerns
The year had its low points, however. “The calendar year was marked by environmental disasters,” said a head of marine conservation. “A significant shipping incident in the North Sea and a spill of industrial pellets off the southern coast highlighted ongoing threats. Dedicated individuals are working tirelessly to defend and heal our marine habitats.”
