In the North of Scotland we dont get
bream, tench, carp, crucean, roach, bleak,
we do get
Freshwater -
Salmon, Pike, Artic Char, Brown Trout, Rainbow Trout, Sea Trout which are all common freshwater fish and are edible although I wouldnt eat Pike.
Catch and release is up to the fisherman and is really just common sense.
Saltwater -
Sea Fishing from the shore, common fish are Cod, Mackeral, Dogfish, Pollack, Coalfish, Conger Eel, Ling, Dogfish and all sorts of flatfish and flounders.
You can eat them all but I would give the Eels a miss.
We are a bit spoilt for choice and generally turn our noses up at farmed fish and would have to be really hungry to eat bottom feeders like catfish, carp etc