Yes but they aren't flat on one side with a melon on the other though.The body isn't always perfectly symmetrical, girls always have one boob slightly bigger than the other!
But you're right it does seem strange that it would be so uneven in many cases if that were the cause. Next time someone loses a big silver with DE they need to do some dissecting and try to see just what is in there behind the droopy eye.
Cool, would love to see some pics. What was their growth rate over the 4 years?I have run a experiment for the last 4 years on this problem with silver arowanas , in two large vats 21' x 8' x 2' deep I had 7 fish in each , over just the last year I had one fish develop it in one of it's eyes. The fish are now 3 feet and have been raised on floating sticks and frozen smelt that they did eat off the bottom, although not many made it that far.
Edit: your the one that had them up for sale with snookn a couple years back. They were in with some oscars too?