Icefish

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 American smelt (or icefish), Osmerus mordax, averages 10 in. (25 cm) in length and 1 lb (.45 kg) in weight. It is valued for its delicious, fragrant flesh, although its feeding habits are destructive and sometimes cannibalistic.

The Icefish of the Antarctic such as Pseudochaenichthys georgianus have no haemoglobin in their blood and rely on gases dissolved in the plasma, this helps them become invisible, or at least harder to see. They can survive like this because 1) they ...

OSMERIFORMES
argentines, deepsea smelts, barreleyes, slickheads, tubeshoulders, leptochilichthyids, salamanderfishes, smelts, ayu fishes, icefishes, New Zealand smelts, galaxiids
SALMONIFORMES
whitefishes, graylings, salmons, trouts, chars ...

[256] This helped identify genes required for vision and pigmentation, such as crystallins and the melanocortin 1 receptor.[257] Similarly, comparing the genome of the Antarctic icefish, which lacks red blood cells, ...

See also: Crocodile, Salmon, Whale, Cichlid, Diver