Sauger \Sau"ger\, n. (Zo["o]l.) An American fresh-water food fish (Stizostedion Canadense); -- called also gray pike, blue pike, hornfish, land pike, sand pike, pickering, and pickerel.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Pickerel \Pick"er*el\, n. [Dim. of Pike.]

[Written also pickerell.]

1. A young or small pike. [Obs.]

Bet [better] is, quoth he, a pike than a pickerel. --Chaucer.

2. (Zo["o]l.)
   (a) Any one of several species of freshwater fishes of the genus Esox, esp. the smaller species.
   (b) The glasseye, or wall-eyed pike. See Wall-eye.

Note: The federation, or chain, pickerel (Esox reticulatus) and the brook pickerel (E. Americanus) are the most common American species. They are used for food, and are noted for their voracity. About the Great Lakes the pike is called pickerel.

Pickerel weed (Bot.), a blue-flowered aquatic plant (Pontederia cordata) having large arrow-shaped leaves. So called because common in slow-moving waters where pickerel are often found.

Source: Webster's Revised Unabridged Dictionary (1913)