摘要乌苏里拟鲿(Pseudobagrus ussuriensis)雄鱼的生长速度明显高于雌鱼,但目前对于其雄性化的研究较少。目前常用的甲基睾丸酮(methyltestosterone,MT)和芳香化酶抑制剂(aromatase inhabitor,AI)均可较高比例的诱导遗传上的雌性鱼转变为生理上的雄性鱼,但诱导转化的雄鱼往往具有较低的成活率。本次实验通过中心复合实验设计和响应曲面法考察MT、AI浓度联合效应对乌苏里拟鲿雄性率、成活率以及生长率的影响。得出主要结果如下:
1。 雄性转化率随着MT浓度的增加呈先升后降趋势,随着AI浓度的增加同样呈先升后降趋势。MT浓度的一次效应对乌苏里拟鲿雄性转化率具有极显著影响(P<0。01),MT浓度的二次效应、AI浓度的一次效应对乌苏里拟鲿雄性转化率具有显著影响(P<0。05),AI浓度的二次效应和MT、AI浓度间的互作效应对乌苏里拟鲿雄性转化率均无显著影响(P>0。05)。对实验数据进行二次多元回归拟合,MT、AI浓度对乌苏里拟鲿雄性转化率的实际二次多项回归方程为:
Y=48。91333+0。52417MT+0。093589AI+3。8×10-4MT×AI-3。85×10-3MT2-2。28×10-4AI2
2。 存活率随着MT浓度的增加呈先大幅度上升后缓慢下降趋势,随着AI浓度的增加同样呈先升后降趋势,但在设定浓度范围内变化幅度不显著。MT浓度的一次效应对乌苏里拟鲿存活率具有极显著影响(P<0。01),MT、AI浓度的二次效应对乌苏里拟鲿成活率具有显著影响(P<0。05),AI浓度的一次效应和MT、AI浓度间的互作效应对乌苏里拟鲿存活率均无显著影响(P>0。05)。对实验数据进行二次多元回归拟合,MT、AI浓度对乌苏里拟鲿存活率的实际二次多项回归方程为:
Y=88。3144+0。051055MT+0。06204AI+2。73×10-4MT×AI-2。01×10-3MT2-2。89×10-4AI2
3。 特定增长率随着MT浓度的增加呈先升后降趋势,随着AI浓度的增加同样呈先升后降趋势。MT浓度的一次效应、二次效应对乌苏里拟鲿特定增长率具有显著影响(P<0。01),AI浓度的一次效应、二次效应乌苏里拟鲿特定增长率具有显著影响(P<0。05),MT、AI浓度间的互作效应对乌苏里拟鲿特定增长率无显著影响(P>0。05)。对实验数据进行二次多元回归拟合,MT、AI浓度对乌苏里拟鲿特定增长率的实际二次多项回归方程为:
Y=1。87294+0。02837MT+4。68×10-3AI-3。17×10-6MT×AI-2。13×10-4MT2-1。22×10-5AI2
4。 通过对3个指标同时进行优化,得出最优组合MT浓度为58mg。kg-1,AI浓度为176mg。kg-1,此时特定增长率为3。21、成活率为89。33%、雄性率85。18%,模型可信度为93。9%,说明模型具有较高的可信度,可为乌苏里拟鲿雄性化生产提供理论指导。93230
毕业论文关键词:乌苏里拟鲿、雄性率、生长率、存活率、甲基睾丸酮、芳香化酶抑制剂
ABSTRACT The growth rate of males in Pseudobagrus ussuriensis was significantly higher than that in females, but there were few studies on their masculinization。 Commonly used methyltestosterone (MT) and aromatase inhibitors (AI) can induce a high proportion of inherited female fish to physiological male fish, but the sex reversal of male is often with a lower survival rate。 In this experiment, the effects of MT and AI concentration on male rate, survival rate and growth rate were studied by central composite experiment design and response surface method。 The main results are as follows:
1。 With the increase of MT concentration, the conversion rate of male increased first and then decreased, and with the increase of AI concentration, it also increased first and then decreased。 The linear effects of MT on Male rate was highly significant (P<0。01), the quadratic effects of MT and the linear effects of AI were significant (P<0。05), the quadratic effects of AI and the primary interactive effect of MT and AI were not significant on male rate (P>0。05)。 The results of quadratic multiple regression analysis of experimental data and the actual quadratic regression equation of MT and AI concentration on male rate of P。 ussuriensis were: