I'm also curious how that works, either they hand feed the bottom one, or if they both share the same stomach, feed the top half and the bottom still gets nutrition.
I think they share the same stomach if not I'm sure the bottom half would have died by now causing the entire fish to decay. also seems as though the top half is stronger & feeding. It would be an extremly( unless the doctors did it for purely scientifical purpose) expensive surgery to seperate conjioned fish. The organs are more delicate so to easy to damage. All in all the risk is not worth the life of those fish.
probably some veterinary hospital would be interested in him.. they could study him and maybe even be successful at separating them..they will die eventually.. i am surprised they made it this long.. one thing is that it is not right to leave them this way.