Ruvettus pretiosus, commonly known as the oilfish, is a species of fish found in deep ocean waters. It belongs to the family Gempylidae and is known for its elongated body and dark blue coloration. The oilfish can grow up to 2 meters in length and is characterized by its high oil content, particularly in its flesh. This fish is primarily found in tropical and subtropical regions of the Atlantic, Indian, and Pacific Oceans. While it is not commonly targeted by commercial fisheries, it is sometimes caught as bycatch. Due to its high fat content, consumption of oilfish can lead to gastrointestinal issues if not prepared properly.