Olive ridley turtles (Lepidochelys olivacea) are a widely distributed species that nest synchronously in huge masses on specific beaches around the world. In India their nesting sites include the Andaman and Nicobar Islands, northern Tamil Nadu, and Andhra Pradesh. However, it is Orissa that supports the Olive Ridley’s three most important breeding beaches – which are witness to the arribada year after year.
Almost half a million turtles nest here annually,
between January and March, on the beaches of Gahirmatha in the Bhitarkanika
Wildlife Sanctuary (Kendrapada district), the mouth of the river Rushikulya
(Ganjam district) and the mouth of the river Devi (Puri district).
Today, Gahirmatha is the only remaining place worldwide where the famed
mass nesting or arribada has consistently being taking place over the
last decade. From 1975 onwards Gahirmatha has supported the largest
reported arribadas which range from a 100 – 700,000 nesting turtles every
year. Recent genetic studies suggest that these Olive Ridleys that nest
in Orissa and India’s east coast are distinct from other ridleys and could even
be the ancestors to populations in other ocean basins. This theory emphasizes the
need to conserve this population - as an evolutionarily significant unit as
well as a management unit.