What do i do wrong? (rendering a fish with downloaded texture)

I downloaded a mesh with blendfile and i cannot seem to render the fish with texture in blender v 2.91 it seems like the texture is already set up although i cant see coordinates option, the texture doesnt show up on the render just a blue fish
fish i downloaded

It has a material file, but it’s missing all the appropriate nodes. I appended it in to a new scene, deleted the old material, slapped a new one on it, and lead it to the texture file, and it showed up just fine.