2025 Proclaimed the 'Year of the Octopus' Off Britain's Southern Shores.
Record-breaking encounters of one of the world's most intelligent invertebrates during the summer season have prompted the naming of 2025 as the octopus's year in a yearly report of UK coastal waters.
A Perfect Storm Leading to an Explosion
A gentle winter coupled with a very warm springtime triggered a huge population of Mediterranean octopuses to settle along England’s south coast, from Penzance in Cornwall to south Devon.
“The reported landings was approximately 13 times what we would usually anticipate in Cornish waters,” explained an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were caught in British seas this year – representing a massive jump from what is typical.”
The Mediterranean octopus is native to UK waters but typically so rare it is infrequently encountered. A population bloom is the result of the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant more larvae, possibly in part fuelled by significant populations of spider crabs noted in recent years.
A Historic Event
The last time, such an octopus proliferation of this size was recorded in the mid-20th century, with archival data indicating the previous major event happened in 1900.
The sheer quantity of octopuses meant they could be frequently seen in shallow waters for the first time in living memory. Diver videos show octopuses being sociable – unlike their typical solitary behavior – and “walking” along the ocean floor on their tentacle tips. A curious octopus was even seen investigating a diver's camera.
“The first time I dived off the Lizard peninsula this year I saw five of these creatures,” the officer added. “And these are big. We have two species in the region. One species is rather small, football-sized, but the *Octopus vulgaris* can be with a span of 1.5 meters.”
Looking Ahead & Coastal Highlights
Another mild winter heading into next year suggests the potential another surge next year, because historically, with such patterns, populations have surged again for two years running.
“Still, the chances are low, from previous blooms, that it will go on for a long time,” they stated. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”
The report also celebrated additional positive marine news across British shores, including:
- Highest-ever counts of grey seals recorded in Cumbria.
- Record numbers of the iconic seabirds on a Welsh island.
- A first-ever sighting of the *Capellinia fustifera* nudibranch in Yorkshire, normally residing farther south.
- A variable blenny spotted off the coast of Sussex for the inaugural time.
A Note of Caution
Challenges were also present, however. “The calendar year was marked by environmental disasters,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of plastic pollution off the Sussex coast served as stark reminders. Conservation teams are making huge efforts to safeguard and rehabilitate our marine habitats.”
