The bass in that transition is made up of 5 different png files. (2) dorsal fins, 64x64, lower fin, 64x64, tail, 64x64, and side view, 256x64.
The fin arrangement is different from the bass in that a muskie has one dorsal on top and three on the bottom, I think. That might take a bit of a compromise but I doubt your audience will notice.
Why don't you post the other 4 photos and I'll take a look at them and see what I can do. It's been a while since I tackled an HFX effect. If Le Papy or one of the other folks at Declic sees this post they might have some ideas too.
Joe