A halibut is a type of flatfish from the family of the right-eye flounders (Pleuronectidae). This name is derived from haly (holy) and butt (flat fish), alleged to be called so from being commonly eaten on holy-days. Halibut live in both the North Pacific and the North Atlantic oceans and are highly regarded food fish. Physical characteristics The Halibut is the largest of all flat fish, with an average weight of about 25 lb - 30 lb, but they can grow to be as much as 600 lbs (External Link). T… (More on Halibut)