What are holarctic fish?

• They belong to the holarc sub-species.
  It means the fish are found all around the world in the freshwaters of most northern and arctic regions.
• They are found in the northern freshwaters.
  It means the fish are found all around the world in the freshwaters of most northern and arctic regions.
• They are fish that can be found in the arctic and Antarctic regions oceans.
  It means the fish are found all around the world in the freshwaters of most northern and arctic regions.