Esociformes

Esociformes are a small order of ray-finned fish (the Actinopterygii). There are two families, the Umbridae (mudminnows) and the Esocidae (pikes).

The Esocidae are named after the pike genus Esox.  One highly successful species is Esox lucius or northern pike. 

The Esociform fishes live in freshwater, in North America and northern Eurasia.
The order is very similar to the Salmonidae.

 Families 

 Esocidae 
The family Esocidae has three extant genera (Esox, Novumbra, and Dallia) that comprise a holarctic distribution.

 Umbridae 
Umbridae is another family. So far, the genus Umbra is the only extant genus. The other genera have gone extinct.

 References