The Naked-Head Toothfish
The Naked-Head Toothfish is around 100 cm (39.5 inches) in length. It has a depth range of approximately 550 m (1,800 feet). They predominately reside in the Ross and Antarctic Polar Front South seas.
The Rakery Beaconlamp
The Rakery Beaconlamp is small, only 16 cm (6.3 inches) in length on average, though they have an enormous depth range: 60–1,000 m (197–3,281 feet). They are found in the South Atlantic as well as the Falkland area.
Warming's Lantern Fish
Warming's Lantern Fish swim in depths up to 1,500 meters (4,921 feet). These fish love zooplankton, though many have herbivore tendencies. While found in South Africa's southern waters and the Indian Ocean, older fish will migrate to other places.
The Antarctic Dragonfish
The Antarctic Dragonfish is another deep-sea swimmer–—though only 20 cm (8 inches) in length, they can swim to depths of up to 1,800 meters (5.905 feet) in the Southern Ocean and the Scotia Sea island waters.
To survive the frigid waters of the Arctic Ocean, the Arctic cod—a genetically unrelated fish to the Notothenioids—developed an antifreeze protein nearly identical to the Notothenioid one. This independent development of the same adaptation in response to similar environmental conditions is known as convergent evolution.
The mackerel icefish (Champsocephalus gunnari) is one of a group of species exclusively found in the Southern Ocean known as 'white-blooded' fishes. These fishes survive without the red oxygen carrying pigment haemoglobin in their blood cells that other fishes have. This means their blood is colourless.