2025 Declared the 'Year of the Octopus' Off England's South Coast.

Unprecedented observations of a supremely intelligent sea creature during the summer season have prompted the declaration of 2025 as the year for octopuses in a yearly report of UK coastal waters.

Ideal Conditions for a Population Boom

A mild winter coupled with a very warm springtime catalyzed unprecedented numbers of Mediterranean octopuses to take up residence along the southern coastline of England, from Penzance in Cornwall to south Devon.

“The volume of octopuses caught was approximately 13 times what we would usually anticipate in this region,” stated a marine conservation officer. “Calculating the figures, approximately 233,000 octopuses were present in UK waters this year – representing a massive jump from what is typical.”

*Octopus vulgaris* is native to UK waters but typically so rare it is seldom observed. A population bloom is caused by the dual effect of a mild winter and a warm breeding season. Such favorable circumstances meant more larvae, possibly in part fuelled by significant populations of other marine life seen in the area.

A Historic Event

Previously, such an octopus proliferation this significant was observed in the mid-20th century, with past documentation indicating the last bloom prior to that was in 1900.

The remarkable abundance of octopuses meant they could be easily spotted in nearshore environments for the first time in living memory. Video footage show octopuses being sociable – unlike their typical solitary behavior – and moving along the bottom on their tentacle tips. One individual was even recorded reaching for an underwater camera.

“The first time I dived there this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in the region. The curled octopus is smaller, the size of a ball, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Future Prospects and Other Surprises

Another mild winter going into 2026 meant it was possible another surge in 2026, because in the past, with such patterns, populations have surged again for two consecutive years.

“But, it's improbable, from previous blooms, that it will go on for a long time,” they cautioned. “Marine life is unpredictable these days so it’s a very uncertain scenario.”

The annual review also celebrated other “surprises, successes and joyful moments” around the UK coastline, including:

• Highest-ever counts of grey seals seen in Cumbria.
• Exceptional populations of the iconic seabirds on a Welsh island.
• A first-ever sighting of an unusual mollusc in Yorkshire, normally residing farther south.
• A Mediterranean fish species discovered off the coast of a southern county for the first time.

Not All Positive News

Not everything was good news, however. “The year was bookended by environmental disasters,” said a head of marine conservation. “A major tanker collision in the North Sea and the release of plastic pollution off the Sussex coast were serious issues. Dedicated individuals are making huge efforts to safeguard and rehabilitate our coasts.”