Dissostichus is genus of fish found in southern oceans. Individuals may live for over fifty years, reaching lengths over two metres and weigh over 200 kilograms.

The genus contains two species. Dissostichus eleginoides, the Patagonian toothfish

Patagonian toothfish

The Patagonian toothfish, Dissostichus eleginoides , is a fish found in the cold, temperate waters of the southern Atlantic, southern Pacific, Indian, and Southern Oceans on seamounts and continental shelves around most sub-Antarctic islands.A close relative, the Antarctic toothfish , is found...

, is the type for the genus and is found in temperate and sub-antarctic waters and Dissostichus mawsoni, the Antarctic cod or toothfish, which occurs in icy waters near Antarctica.