Bowfin

Amiidae is a family of primitive ray-finned fish. Only one species, Amia calva, the bowfin, survives today, although additional species in all four subfamilies are known from Jurassic, Cretaceous, and Eocene fossils.
Bowfins are now found throughout eastern North America, typically in slow-moving backwaters, canals and ox-bow lakes. When the oxygen level is low (as often happens in still waters), bowfins can rise to the surface and gulp air into its swim bladder, which is lined with blood vessels and can serve as a primitive lung. Bowfin are also known as mudfish, dogfish, grindle, grinnel, cypress trout, and blackfish.

Amidaee, bowfin  Ami calva and  Lepisosteids (Lepisosteiformes) – the gars are two species in 2 orders in Holostei infraclass.

The bowfin, a living fossil not to be confused with the snakehead (family Channidae from Africa and Asia)

Bowfin and snakehead

Photos:

Bowfin an Snakehead

References:

http://en.wikipedia.org/wiki/Holostei

http://en.wikipedia.org/wiki/Amiidae

http://en.wikipedia.org/wiki/Channidae

http://vi.wikipedia.org/wiki/H%E1%BB%8D_C%C3%A1_qu%E1%BA%A3

http://en.wikipedia.org/wiki/Ophiocephalus_striatus

http://www.arowana.com.vn/forum/f76/nuoi-ca-loc-lam-canh-7035.html