Icefish are a unique group of fish found primarily in the cold waters of the Southern Ocean surrounding Antarctica. They belong to the family Channichthyidae and are known for their transparent bodies and lack of hemoglobin, the protein that carries oxygen in most fish. This adaptation allows them to thrive in oxygen-rich, frigid waters. These fish have a distinctive appearance, with a gelatinous structure and a large mouth. Icefish primarily feed on small invertebrates and other fish. Their unique adaptations make them an important part of the Antarctic ecosystem, contributing to the food web in these extreme environments.