A research on the percentage of hatchlings of the olive ridley turtle (Lepidochelys olivacea) was carried out between August and October 2002 in Cañas Island, Panamanian Pacific. The experimental design included three different zones of the beach: arrival zone, zone without arrival and hatchery. Three treatments with five nests in each one were established in the arrival zone: uncovered beach, in the border of vegetation and, in the vegetation. Five nets were placed on an uncovered beach at the zone of no arrival and other five nests in the hatchery. Each nest contained 60 eggs. The temperature and relative humidity were monitored at 10 and 40 cm deep, at 09:00, 15:00 and 21:00 hours. The highest values of the percentages of emergency of hatchlings were obtained in hatchery and uncovered beach (zone of no arrival), with 70% and 60.4 % without significant differences among them. The zone at the border of the vegetation showed 51 % and under the vegetation 23 %. The incubation period was between 54 and 65 days. Significant differences were found on temperature and humidity among experimental units, thus influencing the percentage of emergency of hatchlings, the hatching time and carapace length and weigh of neonate.
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