2025 Hailed as 'The Octopus Year' Off England's South Coast.
Exceptionally high encounters of a remarkably clever cephalopod this past summer have resulted in the declaration of 2025 as the octopus's year in a yearly report of UK coastal waters.
A Confluence of Factors for a Population Boom
An unusually warm winter followed by a very warm springtime prompted a massive influx of Mediterranean octopuses to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.
“The reported landings was approximately 13 times what we would usually anticipate in this region,” commented a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were caught in UK waters this year – representing a massive jump from the norm.”
The common octopus is indigenous to British seas but typically so rare it is seldom observed. An explosive growth is the result of the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant more larvae, maybe aided by significant populations of spider crabs noted in recent years.
An Uncommon Occurrence
Previously, an octopus bloom of this size was recorded in the mid-20th century, with historical records indicating the previous major event occurred in 1900.
The huge numbers of octopuses meant they could be frequently seen in coastal areas for the first time in recent history. Underwater recordings show octopuses gathering in groups – they are usually solitary – and “walking” along the seabed on their tentacle tips. A curious octopus was even seen investigating a diver's camera.
“During a first dive there this year I saw five octopuses,” the officer added. “They are large specimens. Two kinds exist in the region. The curled octopus is rather small, the size of a ball, but these common octopuses can be with a span of 1.5 meters.”
Looking Ahead & Coastal Highlights
A second gentle winter heading into next year meant it was possible a second bloom in 2026, because historically, in similar situations, the blooms have repeated for two consecutive years.
“But, it's improbable, looking at history, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”
The report also noted additional positive marine news across British shores, including:
- A record number of grey seals observed in Cumbria.
- Record numbers of the iconic seabirds on an island off Wales.
- The first recording of the *Capellinia fustifera* nudibranch in a northern county, normally residing farther south.
- A variable blenny found off the coast of a southern county for the inaugural time.
A Note of Caution
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 Sussex coast highlighted ongoing threats. Conservation teams are working tirelessly to protect and restore our coasts.”