Killi
Families of Aquarium Fishes
Freshwater Aquarium Fishes

Anabantiformes
Anabantoidei
Channoidei Nandoidei

Labyrinth fishes

Instead of gills, these fish use a rudimentary lung to obtain oxygen and are "air breathers". They have gills too, which they also use but can in fact drown if deprived of a source of air.



Atheridae
Elassomatidae
Melanotaeniidae Percichthyidae

Many related families

Shorefishes, pond and creek fish.










Synbranchiformes
Macrognathus
Mastacembelus Synbranchus

Eels