Whitefish

Whitefish or white fish is a fisheries term for several species of demersal fish with fins, particularly Atlantic cod , whiting (Merluccius bilinearis), haddock (Melanogrammus aeglefinus), hake (Urophycis), and pollock (Pollachius), among others. Whitefish (Coregonidae) is also the name of several species of Atlantic freshwater fish. Whitefish live on or near the seafloor, and can be contrasted with the oily or pelagic fish, which live away from the seafloor.[citation needed][dubious – discuss] Whitefish do not have much oil in their tissue, and have flakier white or light-coloured flesh. Most of the oil found in their bodies is concentrated in the organs, e.g. cod liver oil. Whitefish can be divided into benthopelagic fish (round fish that live near the sea bed, such as cod and coley) and benthic fish (which live on the sea bed, such as flatfish like plaice).

Source: Wikipedia