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| Effects of Incubation Temperature on Hatching and Hatchling Traits in Chinese Box Turtle Cuora flavomarginata |
| YANG Guiqiang1, LI Wentong1, LIN Quan2, ZHENG Huang2, MA Junfeng1, PI Guohua1, NIU Hongjun1, YUAN Ding1 |
1. National Engineering Technology Research Center for Freshwater Fisheries, Beijing Fisheries Research Institute, Beijing 100068, China;
2. Beijing Zhonglin Freshwater Aquaculture Center, Beijing 101399, China;
3. Aquatic Technical Service Station of Shunyi District in Beijing, Beijing 101300, China |
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Abstract Ninety fertilized eggs of Chinese box turtle Cuora flavomarginata were incubated in a constant temperature incubator at temperature of 26 ℃, 28 ℃ and 30 ℃ to evaluate the effects of different temperatures on the hatching rate, and body weight and phenotypic traits of the hatched turtles. The results showed that the fertilized eggs were hatched in 82 d at 26 ℃, 75 d at 28 ℃ and 73 d at 30 ℃, with the maximal hatching rate and short incubation in 28 ℃ group. The juveniles in the 26 ℃ group had significantly lower body weight than that the turtles in the 28 ℃ and 30 ℃ groups did (P<0.05),without significant difference between 28 ℃ group and 30 ℃ group(P＞0.05).The weight gain rate (WGR) and specific growth rate (SGR) of the newly hatched turtles were found to be significantly lower in the test group at 26 ℃ and 28 ℃ than those in the 30 ℃ group (P<0.05) from 1 day post hatching (DPH) to 54 DPH. From 55 DPH to 209 DPH, however, the hatchlings in the 26 ℃ group had significantly higher WGR and SGR than those in the 28 ℃ and 30 ℃ groups (P<0.05). It is considered that 28 ℃ is a suitable temperature condition for Chinese box turtles hatching in Beijing and its surrounding areas. The findings have important theoretical reference and guiding significance for the Chinese box turtle breeding in the Beijing-Tianjin-Hebei region.
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Received: 18 November 2019
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