I'd have to say herring. Loved it as a kid when my Ma did it covered with oatmeal. We are so lucky in Britain to have such a choice of fish.
I once caught a dragonfish off Anstruther Harbour. Nasty wee bastard! The ER of the fish world! Netting Salmon without getting caught is by far the best fishing for this schemie bastard.
Only 9000 miles out, but I will give it you Its the puffer fish, or the Toby fish as he is a gayer in the village