Sentence:  The high roller who had the most ferocious reputation for trying to run the business of the casinos where he played, before he died on December 26, 2006, was Kerry Packer. In the casino world, Packer was the Prince of <WSD>Whales</WSD>. 
Meaning of the word marked with <WSD> tags:  (gambling) In a casino, a person who routinely bets at the maximum limit allowable.