From the BBC:
Summer sun brings sunfish shoal
Giant ocean sunfish have been spotted off the Cornish coast in a survey of marine life.
Nineteen sunfish, generally thought to be a warm-water species, were spotted off the south-western tip of Cornwall.
Sunfish feed mainly on jellyfish and are thought to be following anticipated jellyfish blooms as the summer sea temperatures rise.
The same survey, carried out last Thursday, also detected basking sharks, porpoises, seals and jellyfish.
“This sudden influx of these beautiful, giant fish was a fantastic surprise,” said Dr Brendan Godley, senior lecturer at the University of Exeter Cornwall Campus.
“We only spotted the sunfish lying on their side at the surface so there may have been more below the waves.