I have never tasted this fish, I haven't been lucky enough to be in those regions, but from what I see it must be a good size to allow such generous portions to be prepared.
The family recipes are wonderful, there's something mystical about them that makes it transport us much more than other sophisticated versions, I imagine it has something to do with the power of memory.
You explain very well the steps of the recipe and I think those details to keep in mind that you mention during the cooking process are part of the secret for the result to be so good, at least as good as it looks in the photos, terrific!
Its sad to know you don't have thus fish in your region. It has the best taste in fishes that I tried till now. Doesn't your country import it from other regions? What I know, we export them to many countries.
The truth is that I don't know, I'm going to investigate because I've never heard of it, maybe I know it by another name hahahaha now I'm very curious.