Notothenia is a genus of fish commonly known as Antarctic cod. They are primarily found in the cold waters surrounding Antarctica and are well-adapted to the frigid environment. These fish have a unique antifreeze protein that prevents their blood from freezing, allowing them to thrive in icy conditions. Notothenia species are important to the Antarctic ecosystem and are a key part of the food web. They feed on small invertebrates and are preyed upon by larger predators, including seals and birds. Their presence is vital for maintaining the balance of marine life in the Southern Ocean.