Noun
The pollock, or coalfish; -- called also sillock.
Source: Webster's dictionaryOther names for P. pollachius include the Atlantic pollock, European pollock, lieu jaune, and lythe; while P. virens is sometimes known as Boston blues (distinct from bluefish), coalfish (or coley), silver bills or saithe. Source: Internet
Other light-coloured fish may be used, such as other flatfish, cod or saithe. Source: Internet