The World’s Youngest Male Billionaire Is a 25-Year Old Model With a Massive Fishing Fortune and a Dog That Rides Jet Skis By PAUL SCHRODT October 4, 2018 Gustav Magnar Witzøe is the third-youngest billionaire on earth, according to Forbes’ 2018 ranking. But that’s only part of what makes the Norwegian fish scion so fascinating. Witzøe’s estimated $3 billion net worth is a direct result of his family’s salmon empire. He owns nearly half of SalMar ASA, one of the largest producers of the pink-hued fish. His stake in the Norway-based company was gifted to him in 2013 by his father, Gustav Witzøe, who founded SalMar in 1991. The company has been on the forefront of the industrialization of fish farming in Norway, now one of the country’s biggest industries. In 2016, SalMar harvested close to 130,000 tons of salmon, Forbes reports. As a result, the younger Witzøe now holds the largest fortune in Norway...