sheat·fish 
(shētfĭsh′)
(shētfĭsh′)n. pl. sheatfish or sheat·fish·es
A large freshwater catfish (Silurus glanis) of Eurasia, having a wide mouth and long barbels on the upper jaw. Also called wels catfish.
[Alteration of obsolete sheathfish : SHEATH (translation of German Scheide, sheath, sheathfish) + FISH.]