摘要
自然温度下,分别以泥土、沙子和蛭石为孵化介质,研究了三种孵化介质对黄喉拟水龟(Mauremysmutica Cantor)卵的孵化期、孵化成功率和孵出幼体特征的影响。用泥土、沙子和蛭石作为孵化介质时,孵化期依次缩短,平均孵化期分别为61.2 d、60.9 d、59.4 d,差异显著(P<0.05);孵化期间,卵壳外层出现龟裂现象的卵所占比率分别为0、12.5%、40%;孵化成功率分别为40%、75%、90%。三种孵化介质条件下孵出的幼体的平均体重、体高、尾长和运动能力均无显著差异,而平均背甲长、背甲宽和平均腹甲长、腹甲宽差异显著,其中以蛭石作为孵化介质时孵出的幼体的腹甲宽和背甲宽最大,且运动能力较好。试验结果表明,三种孵化介质中蛭石的孵化效果最好,蛭石作为孵化介质时黄喉拟水龟卵的平均孵化期最短、孵化率最高,且孵出幼体的个体相对较大,并具有较强的运动能力。
Yellow pond turtle（Mauremys mutica Cantor）is a potential aquaculture target in China. Due to its poor reproduction ability, the hatching success and hatchlings quality are very important in aquaculture. In order to get some data about incubation media benefited with hatching, the effects of three different incubation media （clay, sand and vermiculite） on incubation length, hatching success and hatchling traits in yellow pond turtle have been studied in this paper. The eggs from each nest were divided into three groups and each one received one of three incubation treatments （clay, sand or vermiculite as incubation media）. At room temperature, all the viable eggs were buried in media in plastic containers （315 mm ×240 nun × 125 mm ） that were covered with a perforated plastic membrane. During the incubation period, water would be added to the media to compensate for small evaporative losses and water absorbed by eggs. The results showed that incubation length, eggs crack ratio, hatching success and hatchling＇ s size （ carapace length and width and plastron length and width） were affected significantly by incubation media, and some other traits of hatchlings （body height and mass and tail length） were not. The average duration of incubation in clay, sand and vermiculite was 61.2, 60.9 and 59.4 d, respectively, and the difference is significant （P 〈 0.05）. Hatching success were 40%, 75% and 90% for clay, sand and vermiculite treatment respectively. Hatching success and eggs crack ratio were the lowest in clay, and the highest in vermiculite. Carapace width and plastron width of hatchlings from vermiculite were larger than those of hatchlings from sand and clay, and those of hatchlings from clay were the least. The locomotors performance of hatchlings from vermiculite was the best among all treatments. So, vermiculite would be the best incubation medium for yellow pond turtle. The data would be helpful to the turtle aquaculture.
出处
《水产学报》
CAS
CSCD
北大核心
2009年第2期253-258,共6页
Journal of Fisheries of China
基金
国家重点基础研究发展计划项目(2004CB117401)
广东省科技兴渔项目(B200701A06)
关键词
黄喉拟水龟
孵化
介质
孵出幼体
Mauremys mutica Cantor
incubation
medium
hatchlings
