I did not fish so much until now so I don#t know where to filet the fish.
Which station do you need to use for it?
The addon
DoItAll with FCOItemSaver support is able to refine/extract/deconstruct/add mail attachments/trade all stuff with one click.
I'm not sure but maybe it will also allow you to filet the fish at once.
Could you describe me where I have to go/what I haev to to do filet the fish? I'll have a look if I can change it to allow that in a queue too.