Nik in Spain
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The Carangidae are a family of ray-finned fish which includes the jacks, pompanos, jack mackerels, runners, and scads. It is the largest of the six families included within the order Carangiformes. Wikipedia - just in case anyone else wondered... beats me how a beer barrel can desintegrate quickly... (depending on how many divers, the beer itself can be gone in a wink..)That's a pity...
Fata morgana probably.