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Conservationists have branded 2025 the “yr of the octopus” after the eight-legged creatures had been noticed in British waters within the highest numbers for the reason that Fifties.
Rising temperatures and a “heat breeding season” led to document sightings of the octopus vulgaris (frequent or Mediterranean octopus) in south Cornwall and Devon, in keeping with The Wildlife Belief’s annual report.
The charity stated it had been left “flabbergasted” by the “unimaginable” numbers of octopuses – that are native to UK waters however in such small numbers they don’t seem to be usually seen – noticed in the course of the yr.
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The invertebrates had been filmed “strolling”, cleansing themselves, mating, and even grabbing at an underwater digicam, it added.
Round 233,000 octopuses had been caught by native fishers in Cornwall this yr – round 13 occasions the standard quantity, Matt Slater, a marine conservation officer at Cornwall Wildlife Belief, informed The Guardian.
Exceptionally gentle temperatures can result in a “bloom”, or improve within the inhabitants, as a consequence of a hotter breeding season the place larvae usually tend to survive. However a recording of this measurement has not been seen since 1950, the charity stated.
It added it anticipated 2026 to see even larger numbers of octopuses prowling UK seas, with the World Meteorological Organisation predicting rising world temperatures over the subsequent 5 years.
“Octopus eggs are surviving our warming winters so we’re prone to see an everyday prevalence of octopus blooms in future years,” it stated in its annual report.
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It added fisheries would want to “adapt”, as octopuses largely feed themselves on lobsters, crabs and shellfish.
The charity reported plenty of different shocking marine discoveries over the yr, together with the primary UK document of a pink-orange “hair roller” sea slug in Cornwall. Normally resident within the Caribbean, Mediterranean, and western Atlantic coasts, sightings of the nudibranch Spurilla neapolitana had, till now, solely been made as far north as Brest, France.
One of many world’s rarest sharks, an angelshark, was additionally noticed in Cardigan Bay, Wales. The critically endangered shark was caught on underwater cameras for the primary time in 4 years.
Ruth Williams, head of marine at The Wildlife Trusts, stated the yr had been “bookended” by environmental disasters together with the North Sea tanker collision in March and the discharge of tonnes of bio-beads off the Sussex coast in November.
“Regardless of the yr’s challenges, we’ve had moments of pleasure and surprise,” she stated. “Our conservationists have celebrated successes comparable to the primary indicators of puffin breeding on the Isle of Muck and transplanted seagrass rising healthily off the Essex coast.
“They’ve additionally been flabbergasted by the unimaginable numbers of octopuses recorded this yr.”
