The remarkable mass nesting behavior of the olive ridley turtle (Lepidochelys olivacea) is well-known. In the present study, the hatching success of L. olivacea at Sonarpara beach was investigated, for the nesting periods 2023–2024. In the in-situ hatchery, the hatching percentage was recorded high (80%). A total of 73 eggs were hatched out of 91 eggs after 52 days of incubation. In the ex-situ hatchery, the hatching percentage was recorded low (74%). A total of 1070 eggs were hatched out of 1445 after 45–66 days of incubation. A significant difference in hatching percentage was found between the two hatching methods (p < 0.05). Temperature and humidity are the most influential parameters that regulate the hatching of olive ridley. In terms of in-situ study, the surface sand temperature ranged from 36 ℃–42 ℃, while the air temperature was recorded between 34 ℃–37 ℃. In the ex-situ hatchery, the surface sand temperature ranged between 19.2 ℃–34.3 ℃. In the in-situ hatchery, the average sand humidity was recorded 79.9%, and air humidity was recorded 83.68%. The average sand humidity was recorded 73.7% in the ex-situ hatchery, and air humidity was recorded 72.9%. The hatching percentage was recorded high when sand humidity was high in the in-situ hatchery and the hatching rate was found low when the sand humidity was recorded low in the ex-situ hatchery. The present findings designate that there is a positive relation between sand humidity and hatching success. This study also suggests intensifying long-term scientific studies along the whole coast to conserve this vulnerable turtle.

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