Ruff \Ruff\, Ruffe \Ruffe\, n. [OE. ruffe.]

(Zo["o]l.) A small freshwater European perch (Acerina vulgaris); -- called also pope, blacktail, and stone, or striped, perch.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Blacktail \Black"tail`\, n. [Black + tail.]

1. (Zo["o]l.) A fish; the ruff or pope.

2. (Zo["o]l.) The black-tailed deer (Cervus or Cariacus Columbianus) of California and Oregon; also, the mule deer of the Rocky Mountains. See Mule deer.

Source: Webster's Revised Unabridged Dictionary (1913)