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 recognized for its elongated body and dark blue coloration. This fish can grow up to 2 meters in length and is known for its high oil content, which gives it a unique texture and flavor. The oilfish is primarily found in tropical and subtropical regions of the Atlantic Ocean, Indian Ocean, and Pacific Ocean. It is a predatory fish, feeding on smaller fish and squid. Due to its high fat content, consumption of oilfish can lead to gastrointestinal issues if not prepared properly.