Sun 14 Oct 2007
Olive Ridley Sea Turtle
Posted by pieter under Facts
No Comments
Of the sea turtles the Olive Ridley sea turtle is the smallest with a length of only 70 centimetres and a weight up to 50 kilograms. It is named after the olive green colour of its shell. The Olive Ridley sea turtle can only be found on the northern Pacific Coast in Costa on Rica, where Playa Nancite and Ostional are their major nesting sites. Contrary to the other sea turtles like the Leatherback, Hawksbill, Green sea turtle and Loggerhead, which can also be found on the Caribbean beaches of Costa Rica. Although on the list of endangered species the number of Olive Ridley sea turtles seems to stabilize and the sea turtles can be found in the Atlantic, Pacific and Indian Oceans. The main threats for the Olive Ridley sea turtles, trawl fishing and the offshore oil and gas drilling is said to be responsible for the killing of more than 100,000 sea turtles in the last ten years. This is a result of the feeding habits of the Olive Ridley sea turtle. The omnivorous Olive Ridley prefer shallow waters closer to the shore to feed on crabs, shrimp, lobsters, sea grass, algae, snails, fish and small invertebrates. They can reach a depth of 150 metres. The Olive Ridley may be small, but is know for a ‘grand’ spectacle, the so called ‘arribadas. Thousands of female Olive Ridley turtles come ashore in large waves to share a relatively narrow strip of beach to nest. No explanation has been found for this phenomenon, but it is suspected that it has to do with wind direction and certain phases of the moon cycle. The Olive Ridley nest every season and with intervals from two to three weeks produce around 100 eggs per nest. After 50 to 60 days the eggs hatch and the newborn turtles rush to relative safety that the ocean provides. You can imagine how impressive that is, when thousands of nests from an ‘arribada’ hatch and tens of thousands little sea turtles emerge from the sand. Although the population on the coast from Costa Rica, all the way up to Mexico seems stable, the population on the Western Pacific (Surinam, French Guyana and Gyana) is reduced by almost 80%. India hosts the largest population with an estimated 400,000 female Olive Ridley’s nesting every year. The most effective protection measures that have been taken include the regulation of near shore trawl fishing and regulating the harvesting of the turtle eggs.