[untamed]

Not to be gross...but I would genuinely be interested in seeing posted pictures of the autopsy....especially if you think you've found something.

I've not had a large enough fish to perform an autopsy on, but I've often considered it. I have a dissecting microscope for the job. If any of my current fish die mysteriously like that, I'll certainly be having a good look.

I suppose we should be saying "necropsy". Here's a link I found that discussed what you might see and what it might mean:

http://www.koivet.com/handouts/akcanecropsy.doc