IMoO/fdgsefsefsefs_resource_pack/render_controllers/fish.json

{
  "format_version": "1.10.0",
  "render_controllers": {
    "controller.render.fish": {
      "geometry": "Geometry.default",
      "materials": [ { "*": "Material.default" } ],
      "textures": [ "Texture.default" ]
    }
  }
}