I haven't played FT on the PC in aaaages (I'm talking months). I was involved in the beta for the Mac, so mostly played it on that.
I've just gone back to my 3 FT games on the PC and discovered I have 1 fish still alive - a Silky Fatfish.

Everything else is dead (bar the seahorses). I can't believe this little guy survived.... I'll have to make sure I don't sell him!