2025 Proclaimed The Year for Octopuses Along Britain's South Coast.
Exceptionally high observations of a supremely intelligent sea creature during the summer season have resulted in the designation of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.
A Confluence of Factors for a Population Boom
An unusually warm winter and then a very warm springtime prompted unprecedented numbers of common octopuses (*Octopus vulgaris*) to take up residence along the shores from Cornwall to Devon, spanning the Cornish and Devonian coasts.
“The scale of the catch was of the order of about over a dozen times what we would normally expect in the waters around Cornwall,” commented an ocean conservation expert. “Based on the totals, around 233 thousand octopuses were found in these waters this year – which is a significant rise from what is typical.”
*Octopus vulgaris* is indigenous to UK waters but usually so scarce it is infrequently encountered. A sudden increase is the result of the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant more larvae, potentially supported by significant populations of spider crabs seen in the area.
An Uncommon Occurrence
The last time, such an octopus proliferation comparable was documented in the mid-20th century, with archival data indicating the one before that occurred in 1900.
The huge numbers of octopuses meant they could be easily spotted in coastal areas for the first time in recent history. Video footage show octopuses congregating together – contrary to their normally lone nature – and “walking” along the ocean floor on their tentacle tips. A curious octopus was even recorded reaching for submarine recording equipment.
“The first time I dived in that area this year I saw multiple octopuses,” the officer added. “They are large specimens. There are two types in these waters. One species is smaller, about the size of a football, but the *Octopus vulgaris* can be reaching impressive sizes.”
Predictions and Marine Joy
Another mild winter this coming winter could lead to a repeat event the following year, because historically, under these conditions, the blooms have repeated for two consecutive years.
“However, it is unlikely, looking at history, that it will persist indefinitely,” they said. “But the sea keeps giving us surprises these days so it’s quite an unpredictable situation.”
The report also celebrated additional positive marine news along the coast, including:
- Highest-ever counts of grey seals observed in one northern region.
- Peak numbers of puffins on Skomer.
- The first recording of a rare sea slug in Yorkshire, typically a southwestern species.
- A variable blenny found off the coast of a southern county for the first occasion.
Environmental Concerns
The year had its low points, 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 were serious issues. Dedicated individuals are putting in immense work to defend and heal our coasts.”
