This specific 3D model, "Carp fish Low-poly 3D model 39", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
MA (Autodesk Maya, filesize: 5.83 MB), OBJ (OBJ, filesize: 24.7 KB), FBX (Autodesk FBX, filesize: 58.8 KB)