Years ago my dad was a fisherman and when my brother and myself used to work for him we saw loads of these types of fish and by crumbs they don't half have some big spikes on their spine and on the gills. We often got one stuck in your hand and you had to make sure you got it out straight away, because if you didn't your hand would swell up like a balloon.
Red Gurnard was the name but they were called a few other names from time to time I can tell you.
Never mind here is a few pictures of the Shag just about to eat a small Gurnard the other day. Pictures taken just outside the harbour entrance.