What is the meaning of Sheatfish?

A wels catfish (Silurus glanis), the largest freshwater fish in Europe.

Any catfish of genus Silurus.

Any of the species in family Siluridae, including:

  1. Wallago species, found in the Danube and other Eastern European rivers
  2. Micronema species
  3. Phalacronotus species

Wallago species, found in the Danube and other Eastern European rivers

Micronema species

Phalacronotus species

Source: wiktionary.org