In Antarctic Region reptiles and amphibians are absent completely, that is connected to isolation and cold climate of this continent.
Fishes of fresh waters of Antarctic Region are not numerous; they are presented exclusively by descendants of sea-dwelling species. These are fresh-water galaxias and flounders, and also representatives of separate family of vertical flatfishes, living also in waters of South America, New Zealand and Meganesia. The majority of fishes spends only warm season in rivers, and for winter migrates to river mouth or to the sea. For some species fresh waters represent a place of feeding only, and spawning takes place in sea water. However, separate species had adapted to live the year round in rivers of Antarctica, for example, freezing in ice for wintering or digging deep holes in river bottom.