The departing charter group had sought giant trevally and dogtooth. However, during brief interludes of casting to schools of busting yellowfins, two black marlin swam right up to the boat to investigate. At another juncture, they caught two sailfish spotted swimming along a drop-off. What explains all of this fish abundance? At 10° 46’ S, 151° 42’ E, the Conflict Islands lie at the western end of a vast region of equatorial upwelling, a nutrient engine driven by opposite-flowing, spiraling surface currents that suck deep water to the surface. At this latitude, east of Papua New Guinea, the westward-flowing South Equatorial Current splits. One fork swings to the southwest, becoming the East Australian Current. The balance continues eastward, swirling into the complex of islands that includes the Louisiade Archipelago. Like a stretch of boulders in a fast-flowing river, the large-scale ocean equivalent of rapids forms as this enormous mass of water forces its way through to the Torres Strait, the narrow gap between the northern tip of Australia and Papua New Guinea. The entire area experiences turbulent, eddying, nutrient-laden current flow, a giant feeding station for pelagic fish species.