2025 Declared 'The Octopus Year' Off Britain's South Coast.
Record-breaking observations of a remarkably clever cephalopod during the summer season have led to the designation of 2025 as the octopus's year in a yearly report of Britain’s seas.
A Perfect Storm for a Population Boom
A mild winter coupled with a very warm springtime catalyzed a huge population of common octopuses (*Octopus vulgaris*) to establish themselves along England’s south coast, across the southwestern peninsula.
“The reported landings was roughly over a dozen times what we would normally expect in the waters around Cornwall,” explained a marine life specialist. “When we added up the numbers, around 233 thousand octopuses were caught in these waters this year – which is a significant rise from historical averages.”
The common octopus is found in these waters 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. This perfect scenario meant more larvae, potentially supported by abundant stocks of a favored prey species noted in recent years.
A Rare Phenomenon
The most recent occasion, such an octopus proliferation of this size was documented in the mid-20th century, with past documentation indicating the last bloom prior to that was in the turn of the 20th century.
The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for the first time in recent history. Diver videos show octopuses gathering in groups – they are usually solitary – and “walking” along the seabed on their tentacle tips. One creature was even filmed grabbing submarine recording equipment.
“The first time I dived off the Lizard peninsula this year I saw multiple octopuses,” they noted. “And these are big. Two kinds exist in the region. One species is quite small, football-sized, but these common octopuses can be reaching impressive sizes.”
Predictions and Marine Joy
If conditions remain mild heading into next year could lead to a repeat event next year, because in the past, with such patterns, events have occurred consecutively for two years in a row.
“But, it's improbable, based on past events, that it will persist indefinitely,” they cautioned. “But the sea keeps giving us surprises at the moment so it’s quite an unpredictable situation.”
The report also celebrated other “surprises, successes and joyful moments” across British shores, including:
- Unprecedented numbers of grey seals observed in Cumbria.
- Exceptional populations of puffins on an island off Wales.
- The initial discovery of the *Capellinia fustifera* nudibranch in Yorkshire, usually found in the south-west.
- A type of blenny discovered off the coast of a southern county for the first occasion.
Not All Positive News
The year had its low points, however. “The year was bookended by marine incidents,” noted a conservation leader. “A major tanker collision in March and the release of industrial pellets off the Sussex coast were serious issues. Staff and volunteers are putting in immense work to safeguard and rehabilitate our shorelines.”
