Animated Gold Fish
This model is not rigged it has an "in place" swimming animation via looping pointcache. You are able to easily animate the Master helper by hand (like I did as example), or put it to a path.
A full preview of the animation is attached.
Furthermore the scene has a fake caustics light. Done with the standard internal noisemaps.
The textures are about 1K x 0.5K
clip (cutout for the fin ends)
refract mask (fin opacity)
Geometrystack is Editablepoly -> Pointcache -> Turbosmooth.
The fish is fairly large (about 20 cm) size can be easily changed by scaling the masterhelper.
Pointcache files are the same for FBX and Max but were copied to different directory during export.
place the FBX file side by side with the FishGoldy_fpc folder and it should work fine.