In general, leatherback turtles face serious threats at all life stages, both on the beaches where they nest and hatch and in the water where they spend most of their life time. Sea turtle eggs are collected for food, while in some areas juveniles and adults are hunted for their meat and oil. Habitats that are keys to their survival are rapidly being degraded due to coastal development. They are also killed in great numbers as incidental catch, or by catch, in fisheries.
Fish communities in the lagoon of the Tikehau atoll were studied by only a few researchers. Harmelin-Vivien (1984) studied the distribution of the main herbivorous families (Scaridae and Acanthuridae) in the lagoon and on the outer slope to 30 m in depth. The total fish community of the outer slope was studied by Galzin (1985, 1987) at 12 m in depth. These studies were carried out in the southwestern part of the atoll. Spatial organization of coral associated fish community was studied throughout the lagoon by Morize et al. (1990). Most of the other