Creature Feature #333: Icefish

The Icefish are a Suborder of fish that occur in the coldest regions of the Earth - the cold continental shelf surrounding Antarctica. There are currently 122 species known to wikipedia science. To enable survival in such harsh conditions, the Icefish must have special adaptations. Her blood and body fluids contain an antifreeze glycoprotein. She is also the only vertebrate to be completely lacking red blood cells - she has no hemoglobin -  which makes her blood thinner and allows it to circulate more easily about her body. This also means that her blood is colourless. Her heart is very large in proportion to her body size, and consumes 22% of her body's available energy (comapred to the 5% of temperate fish species).