2025 Declared the 'Year of the Octopus' Along England's Southern Shores.

Record-breaking sightings of a remarkably clever cephalopod this past summer have prompted the declaration of 2025 as “the year of the octopus” in a seasonal assessment of Britain’s seas.

A Perfect Storm Leading to an Explosion

A mild winter followed by a remarkably hot spring triggered a massive influx of common octopuses (*Octopus vulgaris*) to settle along England’s south coast, spanning the Cornish and Devonian coasts.

“The volume of octopuses caught was roughly 13 times what we would normally expect in the waters around Cornwall,” commented a marine conservation officer. “When we added up the numbers, nearly a quarter of a million octopuses were caught in these waters this year – which is a significant rise from what is typical.”

The common octopus is native to British seas but typically so rare it is seldom observed. An explosive growth is attributed to a combination of a mild winter and a warm breeding season. Such favorable circumstances meant more larvae, maybe aided by abundant stocks of spider crabs seen in the area.

A Rare Phenomenon

Previously, an octopus bloom comparable was recorded in 1950, with past documentation indicating the one before that was in 1900.

The sheer quantity of octopuses meant they could be easily spotted in nearshore environments for the first time in recent history. Diver videos show octopuses being sociable – they are usually solitary – and “walking” along the seabed on their arm ends. One individual was even seen investigating a diver's camera.

“During a first dive in that area this year I saw five of these creatures,” the officer added. “And these are big. There are two types in these waters. The curled octopus is quite small, the size of a ball, but these newcomers can be with a span of 1.5 meters.”

Looking Ahead & Coastal Highlights

Another mild winter this coming winter meant it was possible a second bloom in 2026, because in the past, with such patterns, the blooms have repeated for two consecutive years.

“Still, the chances are low, based on past events, that it will go on for a long time,” they cautioned. “Marine life is unpredictable currently so it’s a very uncertain scenario.”

The assessment also celebrated additional positive marine news along the coast, including:

• Highest-ever counts of gray seals observed in Cumbria.
• Peak numbers of puffins on a Welsh island.
• A first-ever sighting of an unusual mollusc in Yorkshire, normally residing farther south.
• A type of blenny found off the coast of Sussex for the first time.

A Note of Caution

The year had its low points, however. “The period was framed by environmental disasters,” said a head of marine conservation. “A significant shipping incident in the North Sea and the release of industrial pellets off the southern coast highlighted ongoing threats. Dedicated individuals are working tirelessly to defend and heal our shorelines.”