2025 Declared 'The Octopus Year' Along England's Southern Shores.

Unprecedented encounters of one of the world's most intelligent invertebrates during the summer season have led to the declaration of 2025 as “the year of the octopus” in an annual review of UK coastal waters.

Ideal Conditions Leading to an Explosion

A mild winter and then a remarkably hot spring prompted unprecedented numbers of Mediterranean octopuses to establish themselves along the shores from Cornwall to Devon, from Penzance in Cornwall to south Devon.

“The scale of the catch was roughly thirteen times what we would typically see in this region,” stated an ocean conservation expert. “Calculating the figures, approximately 233,000 octopuses were caught in British seas this year – representing a massive jump from the norm.”

*Octopus vulgaris* is found in British seas but typically so rare it is rarely seen. A population bloom is attributed to a combination of a mild winter and favorable spring temperatures. Such favorable circumstances meant a higher survival rate for young, possibly in part fuelled by abundant stocks of a favored prey species also recorded.

An Uncommon Occurrence

Previously, an octopus bloom this significant was documented in 1950, with past documentation indicating the previous major event was 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 recent history. Underwater recordings show octopuses being sociable – unlike their typical solitary behavior – and ambulating along the ocean floor on the tips of their limbs. One creature was even recorded reaching for an underwater camera.

“During a first dive off the Lizard peninsula this year I saw five octopuses,” the specialist continued. “And these are big. There are two types in the region. One species is quite small, the size of a ball, but the *Octopus vulgaris* can be reaching impressive sizes.”

Looking Ahead & Coastal Highlights

If conditions remain mild going into 2026 meant it was possible a repeat event the following year, because in the past, with such patterns, events have occurred consecutively for two consecutive years.

“But, it's improbable, based on past events, that it will become a permanent fixture,” they cautioned. “But the sea keeps giving us surprises currently so it’s quite an unpredictable situation.”

The report also celebrated additional positive marine news around the UK coastline, including:

• A record number of grey seals recorded in Cumbria.
• Peak numbers of the iconic seabirds on a Welsh island.
• A first-ever sighting of a rare sea slug in a northern county, usually found in the south-west.
• A Mediterranean fish species spotted off the coast of Sussex for the inaugural time.

A Note of Caution

The year had its low points, however. “The calendar year was marked by ecological challenges,” noted a conservation leader. “A major tanker collision in March and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Conservation teams are working tirelessly to safeguard and rehabilitate our marine habitats.”