It's a bit of both, some of the Jellyfish are photographed a few times, there were only so many that washed up but there were tonnes in the water, so the swim I was planning had to be cancelled.
@phortun just showed me a real invasion he saw in Portugal before with Man O war fellyfish, now that's an invasion!!!
This is akin to Crocodile Dundee's: "That's not a knife, this is a knife"!