Record-breaking encounters of a remarkably clever cephalopod this past summer have resulted in the declaration of 2025 as the year for octopuses in an annual review of UK coastal waters.
A mild winter and then an exceptionally warm spring catalyzed a massive influx of common octopuses (*Octopus vulgaris*) to settle along the southern coastline of England, across the southwestern peninsula.
“The volume of octopuses caught was roughly 13 times what we would usually anticipate in Cornish waters,” commented a marine conservation officer. “Calculating the figures, nearly a quarter of a million octopuses were caught in UK waters this year – that’s a huge increase from what is typical.”
The Mediterranean octopus is indigenous to UK waters but usually so scarce it is rarely seen. A population bloom is attributed to a combination of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, potentially supported by large numbers of other marine life noted in recent years.
The last time, a population surge of this scale this significant was recorded in 1950, with historical records indicating the previous major event was in 1900.
The huge numbers of octopuses meant they could be easily spotted in coastal areas for a rare occurrence. Underwater recordings show octopuses gathering in groups – contrary to their normally lone nature – and “walking” along the seabed on their arm ends. One individual was even seen investigating submarine recording equipment.
“The first time I dived there this year I saw multiple octopuses,” the officer added. “They are large specimens. Two kinds exist in UK waters. The curled octopus is quite small, football-sized, but the *Octopus vulgaris* can be reaching impressive sizes.”
Another mild winter this coming winter could lead to another surge next year, because historically, under these conditions, events have occurred consecutively for two years in a row.
“But, it's improbable, from previous blooms, that it will go on for a long time,” they cautioned. “But the sea keeps giving us surprises these days so it’s a very uncertain scenario.”
The report also celebrated additional positive marine news across British shores, including:
Not everything was good news, however. “The period was framed by ecological challenges,” said a head of marine conservation. “A major tanker collision in the North Sea and a spill of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Conservation teams are working tirelessly to protect and restore our coasts.”
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