2025 Declared The Year for Octopuses Along England's South Coast.

Record-breaking sightings of a supremely intelligent sea creature over the summer months have prompted the naming of 2025 as “the year of the octopus” in a yearly report of Britain’s seas.

A Perfect Storm for a Population Boom

A gentle winter coupled with an exceptionally warm spring triggered unprecedented numbers of Mediterranean octopuses to establish themselves along England’s south coast, spanning the Cornish and Devonian coasts.

“The reported landings was of the order of about thirteen times what we would usually anticipate in Cornish waters,” explained an ocean conservation expert. “Calculating the figures, nearly a quarter of a million octopuses were caught in these waters this year – representing a massive jump from what is typical.”

*Octopus vulgaris* is indigenous to British seas but usually so scarce it is rarely seen. An explosive growth is caused by the dual effect of gentle winter conditions and favorable spring temperatures. These ideal conditions meant more larvae, possibly in part fuelled by abundant stocks of spider crabs seen in the area.

An Uncommon Occurrence

The last time, a population surge of this scale comparable was observed in 1950, with past documentation indicating the one before that was in the turn of the 20th century.

The huge numbers of octopuses meant they could be readily observed in shallow waters for the first time in recent history. Diver videos show octopuses gathering in groups – unlike their typical solitary behavior – and ambulating along the ocean floor on the tips of their limbs. One individual was even recorded reaching for submarine recording equipment.

“During a first dive there this year I saw five octopuses,” the officer added. “They are sizeable. We have two species in UK waters. One species is quite small, the size of a ball, but the *Octopus vulgaris* can be with a span of 1.5 meters.”

Predictions and Marine Joy

If conditions remain mild going into 2026 meant it was possible another surge next year, because based on records, under these conditions, populations have surged again for two consecutive years.

“Still, the chances are low, from previous blooms, that it will go on for a long time,” they cautioned. “Marine life is unpredictable at the moment so it’s quite an unpredictable situation.”

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

• A record number of grey seals observed in one northern region.
• Record numbers of puffins on an island off Wales.
• A first-ever sighting of a rare sea slug in Yorkshire, usually found in the south-west.
• A type of blenny spotted off the coast of Sussex for the first occasion.

Environmental Concerns

The year had its low points, however. “The calendar year was marked by marine incidents,” said a head of marine conservation. “A major tanker collision in the North Sea and an accidental discharge of industrial pellets off the Sussex coast were serious issues. Conservation teams are working tirelessly to defend and heal our coasts.”