UK Octopus Boom: Why 2025 Was Named the “Year of the Blooming Octopus” After Record Catches on England’s South Coast

In the final week before Christmas, UK marine reporting put an unexpected species at the center of the seafood conversation: octopus. The Wildlife Trusts’ newly published 2025 marine review described an “unprecedented increase” in Octopus vulgaris—the common (or Mediterranean) octopus—along England’s south coast and framed the phenomenon as “The Year of the Blooming Octopus.”

The scale behind that label is what made it headline news. According to figures compiled from local fishing records and cited in multiple outlets, approximately 233,000 octopuses were caught in UK waters in 2025, around 13 times the level typically expected in Cornish waters. The Wildlife Trusts’ review adds that “incredible” numbers were reported from Penzance in Cornwall into South Devon, and that citizen-science volunteers recorded a 1,500% increase compared with a smaller “mini bloom” reported in 2023.

What exactly was announced this week

The news hook is straightforward: a national marine review compiled by The Wildlife Trusts highlighted a sharp, unusually visible rise in a species that is generally “rarely seen” in UK waters in large numbers.

The review summarised the octopus spike as one of its headline “surprises” of 2025, stating that exceptional numbers of Octopus vulgaris were recorded and that the bloom was helped by a mild winter and a warm breeding season.

Where the bloom was concentrated, and why it was so visible

A key detail repeated across sources is how close to shore these octopuses were. The Guardian reported that the unusually high numbers meant octopuses could be easily spotted in shallow waters, “for the first time in recent history.”

How unusual was the scale in 2025

The coverage includes three “scale markers” that explain why the story gained traction:

• Catch totals: The Guardian quoted an estimate of ~233,000 octopuses caught in UK waters during 2025.
• Relative jump: A Cornwall Wildlife Trust officer described the catch as about 13 times what would normally be expected in Cornish waters.
• Citizen-science comparison: It was reported a 1,500% increase compared with a smaller “mini bloom” in 2023 recorded by Seasearch volunteers.

The “since 1950” comparison is important because it anchors the event historically rather than treating it as a normal seasonal swing.

What explanations were given: temperature, survival rates, and “aligned” conditions

The reporting consistently ties the bloom to weather and sea temperature conditions that favored survival and recruitment.

• Mild winter and a warm breeding season, and these conditions likely allowed more larvae to survive.
• Sea temperatures were 1.5°C to 3°C higher than usual in the Southwest, and that warmer winters allow octopus eggs to survive at higher rates, while noting that “more research is needed” to understand the bloom in more detail.