It can be done, but I have no idea how!
I had a few fish hides years ago they were tanned salmon skins from somewhere in the northwest.
I had traded with someone for them. They were leather just like any other leather, but damn...
you could tell it had been a fish! They made nice knife sheaths.
Since I had got them from some Northwest Native Americans, I would suggest doing some
research on some of the tribes there and finding out which ones tanned fish hides and what
methods they used.
I know eel skins can be tanned also. I still have some eel leather somewhere, it's a very thin
but very tough leather, unlike the salmon which is just much thicker.
