Vicki Spooner, who works for Falmouth Harbour, was surveying the seabed on Thursday near Swanpool and Gyllynvase beaches when she was "amazed to see high concentrations of mauve stinger jellyfish".

The report cited another example in which overpopulation of Pelagia noctiluca jellyfish, known commonly as ”the mauve stinger,” contributed to fish populations dropping in the Adriatic about ...