中国大鲵养殖模式及性腺发育中性激素变化对繁殖影响的初探
发布时间：2019-06-14 07:06
【摘要】：大鲵(Andrias davidianus)俗称娃娃鱼,是当今世界上最大的宝贵两栖动物,具备较高的科研价值和经济价值。本研究通过对大鲵在不同养殖密度、不同温度下大鲵增重率的测定、对大鲵体内睾酮和雌二醇含量的检测及胚胎发育的观察,以期为大鲵的规模化、健康化、生态化、高效化养殖提供信息参考,为两栖类动物系统进化的研究奠定一定的理论基础。试验结果如下：1.09年大鲵的养殖密度为8-10尾/m2、10年大鲵养殖密度为15-20尾/m2、11年大鲵为25-30尾/m2、12年大鲵为50-65尾/m2时表现出较高的体重增长率；09年、10年及11年大鲵在17-21℃范围内对生长的影响作用不大,较平稳。温度对12年大鲵生长的影响最为敏感,随着温度的升高而升高,且增重率在100%以上。2.大鲵各年龄阶段对饵料的选择偏爱为由小到大分别是泥鳅、虾米及小杂鱼、草鱼、鲢鱼。3.亚甲基蓝对大鲵水霉病无明显的治疗效果,大鲵全死亡；大蒜素浓度为7.2ppm(用药时长20min/d)、五倍子2000ppm(用药时长40min/d)、水霉净0.000333mL/mL药水(用药时长20s/次)可缓解水霉病请,并达到治愈的效果,5天后均可下池放养；二硫基醚的浓度为0.0001mL/mL药水、用药时长为50s/次时6天可达到治愈的效果。4.本研究中4批催产的孵化率依次为46%、38%、39%、45%；当大鲵尿液中雌二醇(E2)值在90 pmol/L时所产卵质量最好,授精与产苗最高,雄鲵睾酮(T)值在20 pg/mL时精子活力最好授精与产苗最高。5.大鲵的胚胎发育总计6个阶段,可分为卵裂期、囊胚期、原肠胚期、神经胚期、器官形成期和孵化期(后肢芽)。
[Abstract]:Giant salamander (Andrias davidianus), commonly known as baby fish, is the largest precious amphibian in the world, which has high scientific and economic value. In this study, the weight gain rate of giant salamander under different culture density and temperature, the content of testosterone and estrogen in giant salamander and the observation of embryo development were measured, in order to provide information reference for large-scale, healthy, ecological and efficient culture of giant salamander, and to lay a certain theoretical foundation for the study of systematic evolution of amphibians. The results were as follows: the culture density of giant salamander was 8 鈮，
本文编号：2499212
[Abstract]:Giant salamander (Andrias davidianus), commonly known as baby fish, is the largest precious amphibian in the world, which has high scientific and economic value. In this study, the weight gain rate of giant salamander under different culture density and temperature, the content of testosterone and estrogen in giant salamander and the observation of embryo development were measured, in order to provide information reference for large-scale, healthy, ecological and efficient culture of giant salamander, and to lay a certain theoretical foundation for the study of systematic evolution of amphibians. The results were as follows: the culture density of giant salamander was 8 鈮，
本文编号：2499212
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