Marine Wildlife Encyclopedia
Blackfin Icefish Chaenocephalus aceratus
In the freezing waters around Antarctica, the temperature can fall to nearly 28°F (–2°C). This is below the temperature at which the blood of most fish would freeze. The blackfin icefish has a natural antifreeze in its blood that helps it survive in these conditions. It has no red blood cells and so appears a ghostly white. This makes its blood thinner so that it can flow freely in the cold temperatures. The blackfin icefish is a sluggish hunter of small fish and krill and needs little oxygen.