2025 Declared 'The Octopus Year' Along Britain's South Coast.
Exceptionally high encounters of a supremely intelligent sea creature this past summer have prompted the naming of 2025 as the octopus's year in a yearly report of Britain’s seas.
A Perfect Storm Leading to an Explosion
A mild winter and then a remarkably hot spring triggered unprecedented numbers of Mediterranean octopuses to settle along England’s south coast, across the southwestern peninsula.
“The scale of the catch was approximately over a dozen times what we would usually anticipate in this region,” explained a marine conservation officer. “Calculating the figures, around 233 thousand octopuses were found in these waters this year – which is a significant rise from what is typical.”
*Octopus vulgaris* is native to these waters but ordinarily in such small numbers it is seldom observed. A sudden increase is caused by the dual effect of gentle winter conditions and favorable spring temperatures. Such favorable circumstances meant increased juvenile survival, possibly in part fuelled by significant populations of a favored prey species also recorded.
A Historic Event
The last time, a population surge of this scale of this size was observed in the mid-20th century, with archival data indicating the previous major event was in the turn of the 20th century.
The remarkable abundance of octopuses meant they could be easily spotted in coastal areas for a rare occurrence. Diver videos show octopuses being sociable – contrary to their normally lone nature – and ambulating along the ocean floor on the tips of their limbs. A curious octopus was even recorded reaching for a diver's camera.
“During a first dive there this year I saw five octopuses,” the officer added. “And these are big. Two kinds exist in the region. One species is rather small, about the size of a football, but these newcomers can be up to a metre and a half wide.”
Future Prospects and Other Surprises
A second gentle winter going into 2026 suggests the potential a repeat event in 2026, because in the past, under these conditions, events have occurred consecutively for two consecutive years.
“However, it is unlikely, from previous blooms, that it will persist indefinitely,” they cautioned. “The ocean is full of surprises at the moment so it’s quite an unpredictable situation.”
The annual review also celebrated additional positive marine news across British shores, including:
- Highest-ever counts of gray seals observed in Cumbria.
- Record numbers of puffins on a Welsh island.
- The initial discovery of an unusual mollusc in Yorkshire, usually found in the south-west.
- A variable blenny found off the coast of a southern county for the first occasion.
A Note of Caution
Not everything was good news, however. “The period was framed by ecological challenges,” stated an expert. “A major tanker collision in March and an accidental discharge of plastic pollution off the southern coast highlighted ongoing threats. Dedicated individuals are working tirelessly to defend and heal our shorelines.”