2025 Declared The Year for Octopuses Along England's Southern Shores.
Exceptionally high observations of a remarkably clever cephalopod this past summer have prompted the designation of 2025 as “the year of the octopus” in a seasonal assessment of Britain’s seas.
A Perfect Storm for a Population Boom
An unusually warm winter followed by a very warm springtime prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, from Penzance in Cornwall to south Devon.
“The scale of the catch was of the order of about 13 times what we would normally expect in Cornish waters,” explained a marine conservation officer. “Based on the totals, approximately 233,000 octopuses were caught in these waters this year – which is a significant rise from historical averages.”
The Mediterranean octopus is indigenous to UK waters but ordinarily in such small numbers it is seldom observed. A sudden increase is the result of a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, maybe aided by abundant stocks of spider crabs noted in recent years.
An Uncommon Occurrence
Previously, a population surge of this scale of this size was recorded in the 1950s, with archival data indicating the one before that occurred in the turn of the 20th century.
The remarkable abundance of octopuses meant they could be readily observed in shallow waters for the first time in living memory. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and moving along the bottom on their tentacle tips. A curious octopus was even seen investigating a diver's camera.
“During a first dive 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 quite small, the size of a ball, but these common octopuses can be up to a metre and a half wide.”
Looking Ahead & Coastal Highlights
A second gentle winter going into 2026 suggests the potential a repeat event the following year, because in the past, under these conditions, events have occurred consecutively for two years in a row.
“Still, the chances are low, based on past events, that it will persist indefinitely,” they said. “The ocean is full of surprises currently so it’s a very uncertain scenario.”
The assessment also celebrated other “surprises, successes and joyful moments” across British shores, including:
- A record number of gray seals recorded in Cumbria.
- Record numbers of the iconic seabirds on an island off Wales.
- The initial discovery of an unusual mollusc in a northern county, normally residing farther south.
- A variable blenny found off the coast of Sussex for the first occasion.
Environmental Concerns
Challenges were also present, however. “The period was framed by marine incidents,” said a head of marine conservation. “A major tanker collision in March and an accidental discharge of industrial pellets off the southern coast served as stark reminders. Conservation teams are working tirelessly to safeguard and rehabilitate our shorelines.”
