The orca 3d model was made in blender 2.9 and painted in substance painter,it counts with 10,032 verts, comes with 4k and 2k textures : diffuse , normal , roughness and AO maps , baked normal map from a high poly model and place it in the low poly model , uv wrapped manually , eye, tongue and teeth (the teeth is the only one overlapping ) all is in one texture .
It is fully rigged with basic bones , it have a total of 5 animations : idle , swim1 ,swim 2 ,speedup and a breathe/jump one , more details on the video above.
Comes with fbx ,obj , mtl and stl formats and a blend file with all textures used so you can edit it to your liking .
if you have more compatibility questions download this model https://www.cgtrader.com/free-3d-models/animals/fish/tuna-fish-9f41924a-83d4-478e-a8e9-370946f141b3 and see if it works in your project