By comparison, it is relatively fuel-efficient to target deep sea species such as menhaden and mackerel, most of which are ground up into meal or used for oil for unsustainable fish farms.
与此相反，捕捞深海鱼类，如鲱鱼、鲭鱼则相对能源效率较高，其中大部分用作食品，或用作难以持续的养鱼场的油料。