连江黄岐湾三倍体福建牡蛎湾内、 外养殖群体的形态差异分析

Comparison analysis and path analysis of quantitative traits of triploid Crassostrea angulata cultured in inner and outside Huangqi Bay,Fujian Province

为研究海湾内外三倍体福建牡蛎(Crassostrea angulata)的养殖效果,随机采集了连江黄岐湾湾内和湾外同批延绳平挂养殖的9月龄三倍体福建牡蛎各85个。应用单因素方差分析、多元回归分析、通径分析对壳长(X_(L))、壳宽(X_(W))、壳高(X_(H))、全重(TW)和肉重(MW)形态指标进行分析。结果表明:除壳高外,湾外牡蛎其余指标均显著大于湾内牡蛎,湾外牡蛎外形更圆,肥满度更高。通过多元回归分析建立了壳形态对全重的最优回归方程。通径分析表明,湾内和湾外牡蛎壳长、壳宽和壳高均可对全重产生直接正向效应,效应大小依次为壳长>壳宽>壳高;湾内和湾外牡蛎壳长对全重的决定系数均最大,分别为0.226和0.236。全重的相关系数R 2约为0.842,略小于0.850,基本上可以确定壳长、壳宽和壳高是决定全重的主要因素,但其也受壳质量和肥满度等其他因素的影响。

To evaluate the culture performance of triploid Crassostrea angulata cultured in inner and outside Huangqi Bay,9 month ages oysters rope-cultured were sampled randomly in Huangqi Bay,Lianjiang,Fujian Province.The shell length(X_(L)),shell width(X_(W)),and shell height(X_(H)),as well as the total weight(TW)and meat weight(MW)were measured for 85 individuals respectively.One-way analysis,multiple regression analysis and path analysis were used for investigating the morphological variation.One-way ANOVA showed that besides shell height,all morphological parameters of the oysters cultured outside the bay were significantly larger than those in the bay.The oysters cultured outside the bay were more round at shape and higher in meat condition.The optimum multiple regression equations were obtained though stepwise multiple regression analysis.As path analysis,the direct effects of morphological parameters on total weight were in order of shell length>shell width>shell height.Shell length had the maximum direct effect on the total weight,and was the major factor.The correlation indices(R 2)of morphological parameters against the total weight was less than 0.850,indicating some other factors associating total weight,besides shell length,shell width and shell height,such as meat condition and shell weight.