Is there any way to judge whatever fish fillet is fresh (except judging shop itself)?
Accepted answer at How can I tell if fish is fresh? explicitly mentions that it does not apply to fillets.
Only How can I tell if fish is fresh? mentions in passing "For a fillet, really your only hint is whether it just smells at most like the flavor of the fish and not fishy.".
Is there some other weary to judge quality of fish fillet, or is it all of that is available?