Records of new and rare sea events shows how Cornish waters have warmed

A mass gathering of huge spider crabs has been witnessed on Cornwall's south coast, as they gather together for safety as they shed their shells. The papers are full of this event as they describe the venomous crab which is harmless to humans. But this is only one of the events as we have also seen the Blue Fin Tuna which is an endangered species, which were absent from Cornish waters for nearly a century. Now they are regularly seen in the summer and autumn. The multi-coloured sea slug, Babakina anadoni, which measures just 2cm in length and was filmed near an uninhabited rock island in the Isles of Scilly. All these are signs that the average temperature of the sea off the Cornish coastline has warmed enough to change  the habits of sea life.



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