2025 Declared The Year for Octopuses Off England's South Coast.
Record-breaking encounters of one of the world's most intelligent invertebrates during the summer season have prompted the designation of 2025 as the year for octopuses in an annual review of UK coastal waters.
A Confluence of Factors for a Population Boom
An unusually warm winter coupled with a remarkably hot spring catalyzed unprecedented numbers of Mediterranean octopuses to establish themselves along the southern coastline of England, from Penzance in Cornwall to south Devon.
“The scale of the catch was approximately 13 times what we would usually anticipate in this region,” commented a marine conservation officer. “Based on the totals, around 233 thousand octopuses were caught in UK waters this year – that’s a huge increase from what is typical.”
The Mediterranean octopus is native to UK waters but ordinarily in such small numbers it is infrequently encountered. An explosive growth is attributed to the dual effect of gentle winter conditions and favorable spring temperatures. This perfect scenario meant more larvae, possibly in part fuelled by significant populations of spider crabs seen in the area.
A Rare Phenomenon
The last time, a population surge of this scale comparable was observed in 1950, with past documentation indicating the previous major event happened in the turn of the 20th century.
The huge numbers of octopuses meant they could be easily spotted in shallow waters for the first time in living memory. Video footage show octopuses congregating together – they are usually solitary – and ambulating along the seabed on the tips of their limbs. A curious octopus was even seen investigating an underwater camera.
“During a first dive off the Lizard peninsula this year I saw five octopuses,” they noted. “And these are big. There are two types in the region. One species is smaller, 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 heading into next year could lead to a second bloom next year, because historically, with such patterns, populations have surged again for two consecutive years.
“However, it is unlikely, looking at history, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises currently so it’s a very uncertain scenario.”
The report also highlighted further encouraging coastal sightings along the coast, including:
- A record number of gray seals recorded in Cumbria.
- Peak numbers of puffins on Skomer.
- A first-ever sighting of a rare sea slug in a northern county, typically a southwestern species.
- A Mediterranean fish species spotted off the coast of a southern county for the first occasion.
Not All Positive News
Not everything was good news, however. “The period was framed by marine incidents,” noted a conservation leader. “A major tanker collision in March and the release of tonnes of plastic biobeads off the southern coast highlighted ongoing threats. Dedicated individuals are putting in immense work to safeguard and rehabilitate our coasts.”
