Check out Chinese golden fish 3D model on CGTrader for $40. High-quality mesh by aceimagedesign-1: 685252 polys, 492949 vertices. UV Mapped.
MAX (Autodesk 3ds Max, filesize: 32.4 MB), OBJ (OBJ, filesize: 36 MB), FBX (Autodesk FBX, filesize: 33.7 MB), STL (Stereolithography, filesize: 18.2 MB)