48 forms (species and infraspecific taxa) of fish have been encountered in the lake, including roach, carp bream, zander, European perch, ruffe, endemic variety of smelt, two varieties of Coregonus albula (vendace), eight varieties of Coregonus lavaretus, a number of other Salmonidae as well as, albeit rarely, endangered European sea sturgeon.
The New Zealand ruffe, Schedophilus huttoni, is a medusafish of the family Centrolophidae found in all southern oceans south of latitude 18°S, at depths of up to 1,000 m.
The Tasmanian ruffe, Tubbia tasmanica, the only member of the genus Tubbia, is a medusafish of the family Centrolophidae, found in temperate waters in the Indian and southwest Pacific Oceans, at depths of between 700 and 850 m.