I wonder if that would be actually useful? I know that fish parts are often incorporated in fertilizers for plants. But I am wondering what form would the fish have to be in to utilize their benefits? Do they burn the fish then fertilize plants, or do they just process them another way? It would be a whole "circle of life" approach to the hobby (play Lion King Music). I know I use tank mulm and tank water from water changes to fertilize my plants, but I don't think, unless you had a whole load of dead fish, which would raise some questions, it would be efficient to use any dead fish this way. (end Lion King music and add a Homer "Doh!"). I guess I wouldn't mind seeing fish that died and I have enjoyed, have a better end than just the trash heap.