Coregonus Hoyi

from The Collaborative International Dictionary of English v.0.48

Cisco \Cis"co\, n. (Zool.)
   The Lake herring ({Coregonus Artedi}), valuable food fish of
   the Great Lakes of North America. The name is also applied to
   {Coregonus Hoyi}, a related species of Lake Michigan.
   [1913 Webster]