A long-term tagging and nesting study of green and hawksbill turtles in Chagar Hutang, Redang Island was initiated in May 1993. This long-term project will provide basic, yet vital information on the population sizes, monitor yearly population fluctuations, study reproductive and nesting behaviour, and determine the success of “in-situ” and relocated nests. All sea turtles will be double tagged. Measurements on the size of the turtles are also taken to estimate their growth rates. The turtles are also visually examined for scars, injuries and diseases.

Green turtle eggs

Measuring curve carapace length

Labeling of nest

Green turtle returning to the sea after egg laying

*Tag serial number 2100 – 3000 was used to tag sea turtles at their foraging grounds in Malaysia (2009 -2010).

 

Nests of green turtle protected at Chagar Hutang from 1993 – 2011

 

Nests of hawksbill turtle protected at Chagar Hutang from 1993 – 2011

 

Biological information of the green and hawksbill turtles nesting at Chagar Hutang.

Green Turtles

Hawksbill Turtles

Average

Range

Average

Range

Number of nesting per season at Chagar Hutang

361

151-661

8

1-20

Number of females monitored per season

62

21-142

2

1-6

Number of nests per female in a breeding season

5-6

1-12

3-4

1-6

Number of eggs per nest

92

79-103

119

82-158

Inter-nesting interval

10 days

9 – 12 days

15 days

12 – 18 days

Carapace measurements (cm):

  Curve Carapace Length

       Curve Carapace Width

100.25

88.40

98.63-102.39

87.39-89.98

77.63

72.14

79.51-87.5

68.9-75.8

Inter-seasonal nesting frequency

3 – 5 years

1 – 7 years

3 years

1 – 6 years

Total no. of turtles tagged from 1993 – 2011

1094

29