Ruvettus Pretiosus, also known as the oilfish, is a species of fish that is highly valued for its oily flesh. The fish is native to the Indian and Pacific Oceans and is commonly found in deep offshore waters. Synonyms for the oilfish include the escolar, walu, and snake mackerel. These names are often used interchangeably, but they actually refer to different species of fish. The escolar is a close relative of the oilfish and is known for its similar oily texture, while the walu and snake mackerel are two separate species that also possess a rich, oily flavor. Despite their different names, all of these fish are prized by seafood lovers for their unique taste and texture.