As expected in these atoll-strewn environments, the waters surrounding these undersea mountains get very deep, very quickly. The 100-fathom curve is typically just a few hundred yards from land and the 1,000-fathom curve is not much farther than a mile or so offshore. A rich soup of nutrients is created in the inner lagoons of these atolls, and the daily flushing tide helps push that nutrient load into the surrounding offshore waters. This in turn helps attract an abundance of pelagic fish that gleefully forage on the bait concentrations. Striped marlin are seasonal visitors to the Tuamotus but blue marlin are the most prevalent year-round billfish species. With an abundance of 200- to 600-pound blues constantly present in this part of the Pacific, it’s no surprise that ocean-surface ichthyoplankton studies in the area have discovered a high incidence of blue marlin larvae, suggesting these waters are active marlin spawning grounds.