不同螯色罗氏沼虾形态性状对体质量的影响

Effects of Morphometric Traits on Body Weight of Macrobrachium rosenbergii with Different Clamp Colors

运用通径分析方法,研究了2种螯色、不同性别的6月龄罗氏沼虾(Macrobrachium rosenbergii)(深蓝螯色雌虾、深蓝螯色雄虾、浅黄螯色雌虾、浅黄螯色雄虾)的22个形态性状对体质量的决定效应,得到相关系数、通径系数和决定系数,并进行了多元回归分析。结果表明,蓝雌组6个性状、蓝雄组8个性状、黄雌组7个性状、黄雄组6个性状与体质量的相关系数达到极显著水平(P<0.01)。综合考虑相关系数、通径系数大小和可操作性后认为,深蓝螯色雌虾的育种目标性状首选指标是第1腹节宽,深蓝螯色雄虾、浅黄螯色雌虾和雄虾的首选指标均为全长。

The six-months-old Macrobrachium rosenbergii with different clamp colors and sex,i.e.male shrimps with dark blue clamp （MB）,female shrimps with dark blue clamp （FB）,male shrimps with light yellow clamp （MY）,female shrimps with light yellow clamp （FY）,were collected to measure their 22 morphometric traits.The effects of the morphometric traits on body weight were analyzed by path analysis,and the resulted correlation coefficients,path coefficients and determination coefficients were put for multiple aggression analysis.The results showed that the morphometric traits,i.e.six traits of FB group,eight traits of MB group,seven traits of FY group and six traits of MY group were highly significantly correlated with the correlation coefficients of the body weight （P ＜ 0.01）.Considering the correlation coefficients,path coefficients and readiness of traits measurement it is believed that the first abdominal segment width should be the first target trait for breeding of FB and that the body length be the first target trait for breeding of MB,MY and FY.