The dealfish belongs to the family Trachipteridae. All fish in this family are pelagic and are slim eel shaped fish. The dealfish like most of the fish in this family are deepwater fish that usually reside out of reach of the average fisherman and are therefore rarely encountered.
Dealfish live in the Western Indian Ocean around South Africa and in the Eastern Indian Ocean from southern Australia to the New Zealand as well as the waters around Brazil and northward from there. Not sure how far north. Not sure anyone really knows.