sheatfish
noun
sheat·fish
ˈshētˌfish
: a large elongated catfish (Silurus glanis) of central and eastern European rivers that may attain a length of 10 feet and a weight of 400 pounds and that lacks an adipose fin and has the long anal nearly confluent with the caudal
broadly : any of several large catfishes
Word History
Etymology
alteration (perhaps influenced by German schaid sheatfish, from Old High German sceida sheatfish, sheath) of sheathfish