Answer: Icefish have transparent, scale-less skin
Without scales, oxygen diffuses directly through Icefish skin.
Explanation:
The Icefish exhibit many adaptations that protect them against cold environment. These fishes are adapted to lack scales thus they are transparent. These fishes do not have red blood cells. As the scales are absent the oxygen is diffused inside the body directly. They also produce the antifreeze proteins which are responsible for preventing the formation of ice crystals in the blood.
