Oilfish, also known as Ruvettus pretiosus, is a species of fish found in deep ocean waters. It is characterized by its elongated body, large eyes, and a distinctive dark blue to silver coloration. Oilfish can grow up to 2 meters long and are known for their high oil content, which gives them a unique, rich flavor. This fish is primarily found in tropical and subtropical regions of the Atlantic Ocean, Indian Ocean, and Pacific Ocean. While oilfish is edible, it contains high levels of histamine, which can cause scombroid poisoning if not properly handled or cooked.