I just made this fish asset which is animated and rigged but not textured. Feel free to use it. https://sketchfab.com/3d-models/fish-low-poly-rigged-animated-77b7c7c352c94ab080...
You probably won't believe this but I literally just needed an untextured but rigged and animated low-poly fish. THANK YOU! Blender FTW. (I'll give credit :P)
You are welcome. Let me know if you encounter any problem.
