he Kingdom of Tonga lies deep in the heart of the South Pacific. Composed of more than 170 islands, these distant lands are a marlin fisherman’s ultimate dream destination. Since the publication of his encyclopedic book, Blue Marlin Magic, Capt. Steve Campbell has released another 450 or so blues as he continues to climb well beyond the 2,000-marlin mark. But no matter how good you are, you need a great fishery to achieve numbers like these. The equatorial Pacific Ocean features three major west-flowing currents: the North Equatorial, Equatorial and South Equatorial, sandwiching two east-flowing counter-currents. Earth’s rotation causes these currents to spiral as they flow past each other in opposite directions, sucking cold, nutrient-laden water from the deep into the sunlit surface layers in a process called equatorial upwelling. The Indian and Atlantic oceans each have only two west-flowing currents and one counter-current, resulting in much less upwelling than in the Pacific. Over vast areas, phytoplankton species blossom, providing the foundation for an entire enhanced food web, culminating in large numbers of apex predators such as marlin. Place some islands and seamounts in the paths of the currents, throw in a deep trench and you have all the ingredients to attract and hold blue marlin and other pelagic wanderers.