The green turtle, Chelonia mydas, is a globally threatened species with a circum-global distribution in tropical and subtropical waters (Seminoff, 2004). Like most sea turtles, C. mydas is migratory and uses a wide variety of habitats and distant locations during its life cycle (Hirth, 1997). Green turtles' feeding grounds are widely distributed along coastal regions (Bjorndal et al., 1991), each with specific food resource conditions and environmental stresses. Sea turtle growth may be influenced by such local characteristics. Or, they may be influenced by the energy expended during migrations, energy allocation, or genetic origin (Petitet et al., in press). Determining the age of C. mydas individuals is extremely important, since age is an element that influences population dynamics and is also essential for calculating natural growth rates and sexual maturity, which are necessary for developing conservation strategies for sea turtle species. Furthermore, growth rates can be obtained from each growth mark retained in the bone of individuals, allowing the estimation of rates over several years and the detection of ontogenetic changes due to the dynamics intrinsic to the life stage (Snover 2002).