Embryonic development and mobilization of material and energy in oviposited eggs of Takydomus sexlineatus

Three temperatures(24, 27, 30 oC) were used to incubate eggs of Takydomus sexlineatus, for testing the effects of incubation temperatures on egg mass, egg size, incubation length and morphological traits of hatchings. The growth of embryo and embryonic use of material during incubation at 24 ℃ were studied. Eggs were weighed at 5-day intervals to test for temporal changes in egg mass, egg size. When the eggs were hatched, morphological traits and wet mass were measured. Carcass, residual yolk and fat bodies were separated from hatchling T. sexlineatus and were dried with constant temperature at 65 ℃. It was significant that different incubation temperature on hatching had an effect on the length of the incubation period. The incubation length averaged 41.8, 35.4 and 34.0 days at 24 ℃, 27 ℃ and 30 ℃. The embryos were visible to the naked eye at hatching 14 days, after when the embryonic development was accelerated. The incubation temperature significantly influenced the weight and size of hatchlings. At 24 and 27 ℃, yolk was used more sufficiently in hatching process of embryo.